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merge bzr.dev.revno.1905

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bzrlib/xml5.py
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                "bad tag under properties list: %r" % prop_elt.tag
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            name = prop_elt.get('name')
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            value = prop_elt.text
 
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            # If a property had an empty value ('') cElementTree reads
 
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            # that back as None, convert it back to '', so that all
 
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            # properties have string values
 
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            if value is None:
 
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                value = ''
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            assert name not in rev.properties, \
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                "repeated property %r" % name
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            rev.properties[name] = value