842e2e8 unified-isos: Stop erasing metadata on failure

Authored and Committed by lsedlar 7 years ago
    unified-isos: Stop erasing metadata on failure
    
    When saving new metadata fails, the images.json file would be left
    empty. Instead we should not touch it at all.
    
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
    
        
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