[MU4] Fix #310158: Don't null terminate MIDI text meta events #10374
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Resolves: https://musescore.org/en/node/310158
Port of PR #7003 to the master branch
This PR prevents the null terminator of MIDI text meta events from getting exported into the MIDI files.
Apparently the unit tests for MIDI import/export are a) currently disabled and b) only for import anyway, unlike the 3.x branch, so no tests have been amended in this PR