<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_filter_form(self, **kwargs):
 """ If there is a filter_form, initializes that form with the contents of request.GET and returns it. """


        form = None
        if self.filter_form:
            form = self.filter_form(self.request.GET)
        elif self.model and hasattr(self.model._meta, '_is_view'):
            form = VersionFilterForm(self.request.GET)
        return form