fix: allow empty location for cluster update

[daniel-sanche]

Fixes googleapis/google-cloud-python#15311

[gemini-code-assist]

Summary of Changes

Hello @daniel-sanche, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where an empty location_id could cause an error during a cluster update operation. The change ensures that if location_id is not provided, the location field in the cluster protobuf message is correctly set to None, allowing for successful updates in such scenarios. This improves the resilience of the Bigtable client library when handling cluster configurations.

Highlights

• Cluster Update Logic: Modified the _to_pb method in google/cloud/bigtable/cluster.py to conditionally set the location field. Previously, location was always derived from self.location_id, but now it will be set to None if self.location_id is empty.

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[gemini-code-assist]

Code Review

This pull request addresses an issue where updating a cluster could fail if the location was not specified. The change correctly handles cases where location_id is empty by setting the location to None in the protobuf message. The logic is sound and effectively resolves the problem. I have included one suggestion to make the code slightly more concise.

[gemini-code-assist]

This if/else block can be written more concisely by initializing location to None and then conditionally updating it.

Suggested change

	if self.location_id:
	location = client.instance_admin_client.common_location_path(
	client.project, self.location_id
	)
	else:
	location = None
	location = None
	if self.location_id:
	location = client.instance_admin_client.common_location_path(
	client.project, self.location_id
	)