def _get_all_query_string(self, changelist):
    "\n        If there's a default value set the all parameter needs to be provided\n        however, if a default is not set the all parameter is not required.\n        "
    if self.default_filter_value:
        return changelist.get_query_string({self.parameter_name: self.show_all_param_value})
    return changelist.get_query_string(remove=[self.parameter_name])
If there's a default value set the all parameter needs to be provided
however, if a default is not set the all parameter is not required.
def _get_all_query_string(self, changelist):
    "\n        If there's a default value set the all parameter needs to be provided\n        however, if a default is not set the all parameter is not required.\n        "
    if self.default_filter_value:
        return changelist.get_query_string({self.parameter_name: self.show_all_param_value})
    return changelist.get_query_string(remove=[self.parameter_name])