Fix Git.transform_kwarg #899
                
     Merged
            
            
          
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While working on our project I found that
old_repo.git.rev_list('HEAD', max_parents=0)started to work differently after the new release of GitPython and our tests started to fail. After some debugging I found the problem. Kwargs were not transformed correctly if a value was set to 0 due to wrong if condition:The commit also contains a test for the edge case.