a8758c7 Fix this damn UnsupportedComposeError path for the third time

Authored and Committed by adamwill 2 years ago
    Fix this damn UnsupportedComposeError path for the third time
    
    ...with a test this time. Sigh. It really works now! Promise!
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>
    
        
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