Make sure unused places in ChannelHandleMap are initalized #3882
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The using code assumes that empty places are nullptr, which is not the case:
https://doc.qt.io/qt-5/qvarlengtharray.html
This PR fixes the assumption. And hopefully the rasher in https://bugs.launchpad.net/mixxx/+bug/1775497
Unfortunately the over all design is still broken and instead of crashing it will probably now hit VERIFY_AND_DEBUG_ASSERTs that have been added as safety net.
I think for 2.4 a bigger refactoring is required with a better memory management, fixing these edge cases.
Before building on it in #2618