fix #305293: crash on load of score with missing drumset #6184
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Resolves: https://musescore.org/en/node/305293
We have many crashes with a stack trace showing a bad drumset
when calculating a custom notehead.
I don't know how these scores got into this state
(unless the user deliberately unchecked Drumset in the Mixer),
but I know we can prevent the crash
by returning a default notehead when the drumset is missing.
The drumset will still be missing,
so the user will need to do a change isntrument to set it up again,
but it beats a crash.