f6f808b PR#3716: CLI: cancel error msg

Merged and Committed by tkopecek a year ago
    PR#3716: CLI: cancel error msg
    
    Merges #3716
    https://pagure.io/koji/pull-request/3716
    
    Fixes: #3715
    https://pagure.io/koji/issue/3715
    CLI: cancel returns False when build is not existing and cancel returns first error message when more tasks are not existing
    
        
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