Fixed #20978 -- Made deletion.SET_NULL more friendly for MigrationWriter.serialize.
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@ -38,7 +38,8 @@ def SET(value):
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return set_on_delete
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SET_NULL = SET(None)
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def SET_NULL(collector, field, sub_objs, using):
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collector.add_field_update(field, None, sub_objs)
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def SET_DEFAULT(collector, field, sub_objs, using):
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