Some code cleanups

jedi/inference/gradual/annotation.py

@@ -125,11 +125,12 @@ def infer_param(function_value, param, ignore_stars=False):
             ValueSet([builtin_from_name(inference_state, 'str')]),
             values
         )
+        if not values:
+            return NO_VALUES
         return ValueSet([GenericClass(
             dct,
             TupleGenericManager(generics),
-        ) for c in values])
-        pass
+        )])
     return values
 
 

jedi/inference/gradual/stub_value.py

@@ -63,7 +63,9 @@ class StubModuleContext(ModuleContext):
 class TypingModuleWrapper(StubModuleValue):
     def get_filters(self, *args, **kwargs):
         filters = super(TypingModuleWrapper, self).get_filters(*args, **kwargs)
-        yield TypingModuleFilterWrapper(next(filters))
+        f = next(filters, None)
+        assert f is not None
+        yield TypingModuleFilterWrapper(f)
         for f in filters:
             yield f