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* Prevent adding nil label to .AddedLabels or .RemovedLabels There are possibly a few old databases out there with malmigrated data that can cause panics with empty labels being migrated. This PR adds a few tests to prevent nil labels being added. Fix #14466 Signed-off-by: Andrew Thornton <art27@cantab.net> * Add doctor command to remove the broken label comments Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: 6543 <6543@obermui.de>