Issue 3600 missing db connection (#3680)

* Add validator of HTTP methods. Move list of http methods to separate method and add settings for it. Change twig template to generate the methods based on HTTP methods accrodingly

* Throw an exception with the message that DB connection can't be established

src/Command/Debug/DatabaseTableCommand.php

@@ -89,6 +89,14 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
         if ($table) {
             $this->redBean = $this->getRedBeanConnection($database);
+            if (empty($this->redBean)) {
+                throw new \Exception(
+                    sprintf(
+                        $this->trans('commands.debug.database.table.messages.no-connection'),
+                        $database
+                    )
+                );
+            }
             $tableInfo = $this->redBean->inspect($table);
 
             $tableHeader = [