add fix for typing inspect get_origin check

Author: hallvictoria

azure_functions_worker_v2/azure_functions_worker_v2/functions.py

@@ -288,7 +288,8 @@ def get_function_return_type(annotations: dict, has_explicit_return: bool,
         if has_explicit_return and 'return' in annotations:
             return_anno = annotations.get('return')
             if is_generic_type(
-                    return_anno) and get_origin(
+                    return_anno) and typing_inspect.get_origin(
+                    return_anno) is not None and typing_inspect.get_origin(
                     return_anno).__name__ == 'Out':
                 raise FunctionLoadError(
                     func_name,

azure_functions_worker_v2/tests/unittests/test_typing_inspect.py

@@ -92,11 +92,14 @@ class GetUtilityTestCase(unittest.TestCase):
 
     def test_origin(self):
         T = TypeVar('T')
+        class MyClass(Generic[T]): pass
+
         self.assertEqual(get_origin(int), None)
         self.assertEqual(get_origin(ClassVar[int]), None)
         self.assertEqual(get_origin(Generic), Generic)
         self.assertEqual(get_origin(Generic[T]), Generic)
         self.assertEqual(get_origin(List[Tuple[T, T]][int]), list)
+        self.assertEqual(get_origin(MyClass), None)
 
     def test_parameters(self):
         T = TypeVar('T')