Add extra \Error catching on Metadata Display Preview #380
Description
What?
Well the are catching exceptions, but some errors like passing less arguments than expected to a twig extension are ERRORS that don't extend Exception class but are still Throwables. By adding an extra catch we can also show those to the user. The Message descriptions are NOT the best sadly for those, but at least they are a better hint than a PHP error log that is not visible to the user + empty Ajax response.
How to test? break your template like this
you will see that the preview never returns and is invisible to the user. With the new code the user will see this
