cd09ab4 Format NULL bitmap as an empty string

Authored and Committed by Ján Tomko 10 years ago
    Format NULL bitmap as an empty string
    
    This simplifies the usage in {libxl,qemu}DomainGetNumaParameters
    and it's needed for consistent error reporting in virBitmapFormat.
    
    Also remove the forgotten ATTRIBUTE_NONNULL marker.
    
        
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