Assign False to a BooleanField isn't allowed when using a BatchChangeAction

The BatchChangeAction class ignores any value that validate to False, the data is already cleaned at form, so it should be allowed to be used, it is a valid value.

For example, I got a model with a BooleanField, that I want to set to False using the BatchChangeAction, but I can't do that, because the field get removed, so an error about the field been required is raised. Setting the field to True works ok.