sql: allow NULL in _structured columns (#7536)
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@ -836,6 +836,7 @@ class SqlMixin(object):
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i += 1
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if field.store_structured_value:
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value = row[i]
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if value is not None:
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obdata['%s_structured' % field.id] = cPickle.loads(str(value))
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if obdata['%s_structured' % field.id] is None:
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del obdata['%s_structured' % field.id]
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