c69ed04 PR#3007: better error messages for Task.lock()

Merged and Committed by tkopecek 2 years ago
    PR#3007: better error messages for Task.lock()
    
    Merges #3007
    https://pagure.io/koji/pull-request/3007
    
    Fixes: #2834
    https://pagure.io/koji/issue/2834
    unhelpful "non-free but unlocked" errors on hub
    
        
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