Addressing None comment and using correct metadata

Signed-off-by: Ryan Lettieri <ryanLettieri@microsoft.com>

Author: RyanLettieri

durabletask-azuremanaged/durabletask/azuremanaged/client.py

@@ -12,7 +12,7 @@ class DurableTaskSchedulerClient(TaskHubGrpcClient):
     def __init__(self, *,
                  host_address: str,
                  taskhub: str,
-                 token_credential: TokenCredential = None,
+                 token_credential: TokenCredential,
                  secure_channel: Optional[bool] = True):
 
         if taskhub == None:

durabletask-azuremanaged/durabletask/azuremanaged/durabletask_grpc_interceptor.py

@@ -12,8 +12,8 @@ class DTSDefaultClientInterceptorImpl (DefaultClientInterceptorImpl):
     interceptor to add additional headers to all calls as needed."""
 
     def __init__(self, token_credential: TokenCredential, taskhub_name: str):
-        metadata = [("taskhub", taskhub_name)]
-        super().__init__(metadata)
+        self._metadata = [("taskhub", taskhub_name)]
+        super().__init__(self._metadata)
 
         if token_credential is not None:
             self._token_credential = token_credential

durabletask-azuremanaged/durabletask/azuremanaged/worker.py

@@ -12,7 +12,7 @@ class DurableTaskSchedulerWorker(TaskHubGrpcWorker):
     def __init__(self, *,
                  host_address: str,
                  taskhub: str,
-                 token_credential: TokenCredential = None,
+                 token_credential: TokenCredential,
                  secure_channel: Optional[bool] = True):
 
         if taskhub == None: