WIP: Display flash message when Markdown preview fails
What does this MR do?
- display a flash message
Could not load preview!
when Markdown preview fails
Why was this MR needed?
- no user feedback when preview failed
What are the relevant issue numbers?
fixes part of #19057 (moved)
Screenshots
Does this MR meet the acceptance criteria?
- Tests
-
Added for this feature/bug -
All builds are passing
-