Subtitles show no media files in browser when there are some

[karmatosed]

This may be a case of it looking for a very particular file, the trouble is that isn't clear if the case.

I discovered this whilst testing the video widget, but assume its media library. I see the following:

Somewhat of a surprise when my media library shows...

[karmatosed]

It this is a case of the type then lets add a message. something like this:

[sabernhardt]

generic option for clarifying the message

[sabernhardt]

In addition to subtitles, this message appears when attaching an image, audio or video file without any of that type in the library yet.

40806.diff​ is a simple clarification:
"No items found matching this type."

Of course, there could be a better way to phrase that.

If we want to make the message different for each category instead, giving a list of acceptable file formats could help.