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I don’t know if it’s a typo or you intended that way but actually empty_values
(in plural) is not defined in your code anywhere. I also take a look at the source code of the super class MultipleChoiceField
and is not defined there either.
What I could find in the super super class of your class (ChoiceField
) was a reference to validator.EMPTY_VALUES
and of course, it is in capital letters.
The line more alike yours in the source code was this one:
if value == self.empty_value or value in validators.EMPTY_VALUES:
Take a look deep in your code and see if that was what you intended to do.
Hope this helps!
Source:stackexchange.com