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Backport #22021 When getting tracked times out of the db and loading their attributes handle not exist errors in a nicer way. (Also prevent an NPE.) Fix #22006 Signed-off-by: Andrew Thornton <art27@cantab.net> Signed-off-by: Andrew Thornton <art27@cantab.net> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>