* 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 <[email protected]> * Add doctor command to remove the broken label comments Signed-off-by: Andrew Thornton <[email protected]> Co-authored-by: 6543 <[email protected]>