[PATCH] Fix crash when output-preview-framework is missing

[Patrick McCarty]

Hello,

This patch fixes a crash that occurs when the specified backend does
not have an output-preview-framework (used for -dpreview).

I also added a similar check for output-framework just in case a user
tries to add a new backend, but forgets to add output-framework.

Thanks,
Patrick

0001-Fix-crash-when-output-preview-framework-is-missing.patch
Description: Text Data