updated iam templates

Author: daniel-sanche

gapic/templates/%namespace/%name_%version/%sub/services/%service/client.py.j2

@@ -708,7 +708,7 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
     {% if opts.add_iam_methods %}
     def set_iam_policy(
         self,
-        request: Optional[iam_policy_pb2.SetIamPolicyRequest] = None,
+        request: Optional[Union[iam_policy_pb2.SetIamPolicyRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
         timeout: Union[float, object] = gapic_v1.method.DEFAULT,
@@ -797,6 +797,8 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
         # The request isn't a proto-plus wrapped type,
         # so it must be constructed via keyword expansion.
+        if request is None:
+            request = {}
         if isinstance(request, dict):
             request = iam_policy_pb2.SetIamPolicyRequest(**request)
 
@@ -831,7 +833,7 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
     def get_iam_policy(
         self,
-        request: Optional[iam_policy_pb2.GetIamPolicyRequest] = None,
+        request: Optional[Union[iam_policy_pb2.GetIamPolicyRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
         timeout: Union[float, object] = gapic_v1.method.DEFAULT,
@@ -921,6 +923,8 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
         # The request isn't a proto-plus wrapped type,
         # so it must be constructed via keyword expansion.
+        if request is None:
+            request = {}
         if isinstance(request, dict):
             request = iam_policy_pb2.GetIamPolicyRequest(**request)
 
@@ -955,7 +959,7 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
     def test_iam_permissions(
         self,
-        request: Optional[iam_policy_pb2.TestIamPermissionsRequest] = None,
+        request: Optional[Union[iam_policy_pb2.TestIamPermissionsRequest, dict]] = None,
         *,
         retry: OptionalRetry = gapic_v1.method.DEFAULT,
         timeout: Union[float, object] = gapic_v1.method.DEFAULT,
@@ -983,6 +987,8 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
 
         # The request isn't a proto-plus wrapped type,
         # so it must be constructed via keyword expansion.
+        if request is None:
+            request = {}
         if isinstance(request, dict):
             request = iam_policy_pb2.TestIamPermissionsRequest(**request)