def clean(self):
        return self.cleaned_data
Handles `remove` action from CategoryList editor.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/forms/forms.py/BaseForm.clean--crossover with--dataset/ETHPy150Open idlesign/django-sitecats/sitecats/toolbox.py/CategoryRequestHandler.action_remove