handle empty requests in mixins

Author: daniel-sanche

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

@@ -26,6 +26,8 @@
         # Create or coerce a protobuf request object.
         # 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 = operations_pb2.ListOperationsRequest(**request)
 
@@ -82,6 +84,8 @@
         # Create or coerce a protobuf request object.
         # 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 = operations_pb2.GetOperationRequest(**request)
 
@@ -141,6 +145,8 @@
         # Create or coerce a protobuf request object.
         # 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 = operations_pb2.DeleteOperationRequest(**request)
 
@@ -191,6 +197,8 @@
         # Create or coerce a protobuf request object.
         # 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 = operations_pb2.CancelOperationRequest(**request)
 
@@ -244,6 +252,8 @@
         # Create or coerce a protobuf request object.
         # 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 = operations_pb2.WaitOperationRequest(**request)
 
@@ -370,6 +380,8 @@
 
         # 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)
 
@@ -492,6 +504,8 @@
 
         # 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)
 
@@ -552,6 +566,8 @@
 
         # 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)
 
@@ -611,6 +627,8 @@
         # Create or coerce a protobuf request object.
         # 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 = locations_pb2.GetLocationRequest(**request)
 
@@ -666,6 +684,8 @@
         # Create or coerce a protobuf request object.
         # 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 = locations_pb2.ListLocationsRequest(**request)