Warning if sounds/samples are not available

Your idea

When MuseSounds are not available when opening a score, MuseScore falls back to MS Basic without any notice. If you are not aware of this and you save the score, you have to manually revert everything once the sounds are available again. I think there should be a warning along the lines of "Samples not available, loaded MS basic instead".
Taking it further, there could also be an option to choose which alternative you want to load (which I guess would be magnitudes more complicated to implement than a simple warning).

Problem to be solved

Having to change possibly dozens of instruments back to another sound.

Prior art

No response

Additional context

I have to deal with this regularly because I have the Muse Sounds on an external drive that isn't alway connected.

Checklist

• This request follows the guidelines for reporting issues
• I have verified that this feature request has not been logged before, by searching the issue tracker for similar requests

Start by tracing what happens when a score is opened with MuseSounds unavailable and MS Basic is loaded instead. Confirm where the fallback is selected and how a warning could be shown without changing the requested sound behavior. Done means users are clearly warned when samples are unavailable, with the fallback identified as MS Basic.