Fixed ModelAdmin.get_max_num() example if obj is None.
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@ -2212,7 +2212,7 @@ The ``InlineModelAdmin`` class adds:
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def get_max_num(self, request, obj=None, **kwargs):
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max_num = 10
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if obj.parent:
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if obj and obj.parent:
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return max_num - 5
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return max_num
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