Fix/add check for null in gutenberg is block editor function #16201
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Description
This pull request addresses #16199. Adds a null check in the
gutenberg_is_block_editor
function so that we can avoid unexpected errors.How has this been tested?
We are using the mailpoet plugin which utilizes wp_iframe (where this error is occuring). I added this check and the plugin works like it should now.
Types of changes
A very small quick fix to avoid a unexpected 500 error.
Fixes #16199.