Record type filter is required by Client config validator, but when listing, providers can take None.

[dsully]

trafficstars

I'm trying to list records with the Gandi provider - and it can take None as a rtype:

if rtype is not None:
                    query_results = [self._get("/domains/{0}/records/{1}/{2}".format(self.domain_id, self._relative_name(name), rtype))]
                else:
                    query_results = self._get("/domains/{0}/records/{1}".format(self.domain_id, self._relative_name(name)))

However, Client._validate_config raises an AttributeError if type isn't set:

if not self.config.resolve('lexicon:type'):
            raise AttributeError('type')