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[1.10.x] Fixed ModelAdmin.get_max_num() example if obj is None.
Backport of a4e9e834e3
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@ -2211,7 +2211,7 @@ 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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