[FEAT] Warning in the backend if css/js files are missing

[alexh-swdev]

Is there an existing issue for this?

• I have searched the existing issues

Description

Is it possible to show a warning, if expected asset files like js or css are missing when refreshing the caches in the backend?

Background:
Yesterday I realized that since the last update, the admin -> system -> configuration section was unusable. (This was due to a merge error on my side, not from OM core) All other (or at least the daily used) areas in the backend and fronted where still working. The problem was: only there, wrong js urls have been generated for all js-files ( instead of (/) so they could not get loaded.

I then made a quick&dirty fix to handle this and today I realized that I accidentally removed a required js file. This broke js merging and seemed to create the unusable paths. An error message would have helped a lot :)

Expected Behavior

If during cache refresh in the backed a css or js file is missing, a warning pops up.

Benefits

No response

Anything else?

No response

[sreichel]

The merge-feature should be removed after having HTTP/2. imho