Fixed get_field_display method for None value.
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@ -111,6 +111,7 @@ class MultiSelectField(models.CharField):
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fieldname = name
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choicedict = dict(self.choices)
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display = []
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if getattr(obj, fieldname):
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for value in getattr(obj, fieldname):
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item_display = choicedict.get(value, None)
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if item_display is None:
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