Form::getPage() throws error instead of returning null if page has not been initialized yet

[pamtbaau]

According the docs:

public getPage() : \Grav\Common\Page\Markdown\PageInterface/null

Form::getPage() should either returns a page or null. However, when page has not been initialized yet, Grav throws an error:

Return value of Grav\Plugin\Form\Form::getPage() must implement interface Grav\Common\Page\Interfaces\PageInterface, null returned

Stacktrace:

[2021-04-12 17:40:09] grav.CRITICAL: Return value of Grav\Plugin\Form\Form::getPage() must implement interface Grav\Common\Page\Interfaces\PageInterface, null returned -
Trace:
#0 /path/to/user/plugins/qq/qq.php(78): Grav\Plugin\Form\Form->getPage()
#1 /path/to/vendor/symfony/event-dispatcher/EventDispatcher.php(264): Grav\Plugin\QqPlugin->onFormInitialized()
#2 /path/to/vendor/symfony/event-dispatcher/EventDispatcher.php(239): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch()
#3 /path/to/vendor/symfony/event-dispatcher/EventDispatcher.php(73): Symfony\Component\EventDispatcher\EventDispatcher->callListeners()
#4 /path/to/system/src/Grav/Common/Grav.php(556): Symfony\Component\EventDispatcher\EventDispatcher->dispatch()
#5 /path/to/user/plugins/form/classes/Form.php(203): Grav\Common\Grav->fireEvent()
#6 /path/to/user/plugins/form/classes/Form.php(175): Grav\Plugin\Form\Form->initialize()
#7 /path/to/user/plugins/form/classes/FormFactory.php(38): Grav\Plugin\Form\Form->__construct()
#8 /path/to/user/plugins/form/classes/Forms.php(79): Grav\Plugin\Form\FormFactory->createFormForPage()
#9 /path/to/user/plugins/form/form.php(197): Grav\Plugin\Form\Forms->createPageForm()
#10 /path/to/vendor/symfony/event-dispatcher/EventDispatcher.php(264): Grav\Plugin\FormPlugin->onPageProcessed()
#11 /path/to/vendor/symfony/event-dispatcher/EventDispatcher.php(239): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch()
#12 /path/to/vendor/symfony/event-dispatcher/EventDispatcher.php(73): Symfony\Component\EventDispatcher\EventDispatcher->callListeners()
#13 /path/to/system/src/Grav/Common/Grav.php(556): Symfony\Component\EventDispatcher\EventDispatcher->dispatch()
#14 /path/to/system/src/Grav/Common/Page/Pages.php(1822): Grav\Common\Grav->fireEvent()
#15 /path/to/system/src/Grav/Common/Page/Pages.php(1841): Grav\Common\Page\Pages->recurse()
#16 /path/to/system/src/Grav/Common/Page/Pages.php(1841): Grav\Common\Page\Pages->recurse()
#17 /path/to/system/src/Grav/Common/Page/Pages.php(1701): Grav\Common\Page\Pages->recurse()
#18 /path/to/system/src/Grav/Common/Page/Pages.php(1690): Grav\Common\Page\Pages->resetPages()
#19 /path/to/system/src/Grav/Common/Page/Pages.php(1478): Grav\Common\Page\Pages->buildRegularPages()
#20 /path/to/system/src/Grav/Common/Page/Pages.php(315): Grav\Common\Page\Pages->buildPages()
#21 /path/to/system/src/Grav/Common/Processors/PagesProcessor.php(42): Grav\Common\Page\Pages->init()
#22 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(50): Grav\Common\Processors\PagesProcessor->process()
#23 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle()
#24 /path/to/system/src/Grav/Common/Processors/TwigProcessor.php(38): Grav\Framework\RequestHandler\RequestHandler->handle()
#25 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(50): Grav\Common\Processors\TwigProcessor->process()
#26 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle()
#27 /path/to/system/src/Grav/Common/Processors/AssetsProcessor.php(39): Grav\Framework\RequestHandler\RequestHandler->handle()
#28 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(50): Grav\Common\Processors\AssetsProcessor->process()
#29 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle()
#30 /path/to/system/src/Grav/Common/Processors/SchedulerProcessor.php(40): Grav\Framework\RequestHandler\RequestHandler->handle()
#31 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(50): Grav\Common\Processors\SchedulerProcessor->process()
#32 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle()
#33 /path/to/system/src/Grav/Common/Processors/BackupsProcessor.php(39): Grav\Framework\RequestHandler\RequestHandler->handle()
#34 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(50): Grav\Common\Processors\BackupsProcessor->process()
#35 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle()
#36 /path/to/system/src/Grav/Common/Processors/TasksProcessor.php(69): Grav\Framework\RequestHandler\RequestHandler->handle()
#37 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(50): Grav\Common\Processors\TasksProcessor->process()
#38 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle()
#39 /path/to/system/src/Grav/Common/Processors/RequestProcessor.php(63): Grav\Framework\RequestHandler\RequestHandler->handle()
#40 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(50): Grav\Common\Processors\RequestProcessor->process()
#41 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle()
#42 /path/to/system/src/Grav/Common/Processors/ThemesProcessor.php(38): Grav\Framework\RequestHandler\RequestHandler->handle()
#43 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(50): Grav\Common\Processors\ThemesProcessor->process()
#44 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle()
#45 /path/to/system/src/Grav/Common/Processors/PluginsProcessor.php(39): Grav\Framework\RequestHandler\RequestHandler->handle()
#46 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(50): Grav\Common\Processors\PluginsProcessor->process()
#47 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle()
#48 /path/to/system/src/Grav/Common/Processors/InitializeProcessor.php(130): Grav\Framework\RequestHandler\RequestHandler->handle()
#49 /path/to/system/src/Grav/Common/Debugger.php(546): Grav\Common\Processors\InitializeProcessor::Grav\Common\Processors{closure}()
#50 /path/to/system/src/Grav/Common/Processors/InitializeProcessor.php(131): Grav\Common\Debugger->profile()
#51 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(50): Grav\Common\Processors\InitializeProcessor->process()
#52 /path/to/system/src/Grav/Framework/RequestHandler/Traits/RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle()
#53 /path/to/system/src/Grav/Common/Grav.php(295): Grav\Framework\RequestHandler\RequestHandler->handle()
#54 /path/to/index.php(58): Grav\Common\Grav->process()
#55 {main} [] []

[pamtbaau]

Should be issues at form plugin