c5dc032 Fix TypeError raised from override create command

Authored and Committed by cqi 5 years ago
    Fix TypeError raised from override create command
    
    This error does not block creating an override in Bodhi. It fails at
    step to print a summary of the created override. The reason is
    customized save_override does not return a value, so None is passed to
    the first parameter of override_str.
    
    Fixes #256
    
    Signed-off-by: Chenxiong Qi <cqi@redhat.com>
    
        
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