[mkortstiege]

Let me explain it

We check if there's a source for the given file instead of blindly checking the actual existence. This is because checking dozens of files on a unavailable media source (powered of NAS, not connected USB drive) takes ages.

Since it's not a big deal to actual add the media sources this shouldn't be a problem. Of course this is a change in behavior but it only happens for a small percent of the userbase.