Fixed unregistered types in schema

Author: syrusakbary

graphene/core/schema.py

@@ -77,6 +77,7 @@ def schema(self):
             self,
             query=self.T(self.query),
             mutation=self.T(self.mutation),
+            types=[self.T(_type) for _type in list(self._types_names.values())],
             subscription=self.T(self.subscription))
 
     def register(self, object_type, force=False):