Update google/cloud/bigtable/cluster.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: daniel-sanche

google/cloud/bigtable/cluster.py

@@ -511,12 +511,11 @@ def delete(self):
     def _to_pb(self):
         """Create cluster proto buff message for API calls"""
         client = self._instance._client
+        location = None
         if self.location_id:
             location = client.instance_admin_client.common_location_path(
                 client.project, self.location_id
             )
-        else:
-            location = None
 
         cluster_pb = instance.Cluster(
             location=location,