all_git_branches() returns empty owner_name for personal branches

[roanny]

Summary

sdk.all_git_branches(project_id) returns owner_name: "" (empty string) for personal branches where personal: True, while sdk.git_branch(project_id) correctly returns the owner's full name for the same branch.

Expected behavior

all_git_branches() should populate owner_name for personal branches, matching the behavior of git_branch().

Reproduction

SDK: looker-sdk v26.4.0 (Python)
Looker: Google Cloud core 26.2
Python: 3.13.3

import looker_sdk

sdk = looker_sdk.init40()

# Enable dev mode
sdk.update_session(looker_sdk.models40.WriteApiSession(workspace_id="dev"))

# List all branches — owner_name is empty for personal branches
branches = sdk.all_git_branches("my_project")
for b in branches:
    if b.personal:
        print(f"all_git_branches: name={b.name}, personal={b.personal}, owner_name={b.owner_name!r}")
        # Output: all_git_branches: name=dev-user-xxxx, personal=True, owner_name=''

# Get current branch — owner_name is populated
current = sdk.git_branch("my_project")
print(f"git_branch: name={current.name}, personal={current.personal}, owner_name={current.owner_name!r}")
# Output: git_branch: name=dev-user-xxxx, personal=True, owner_name='FULL NAME'

Actual results

Method	personal	owner_name
sdk.all_git_branches()	True	'' (empty)
sdk.git_branch()	True	'FULL NAME'

Impact

Consumers of all_git_branches() cannot identify who owns each personal branch without making an additional git_branch() call per branch (by switching to each one). This affects tools that display branch listings with ownership information.

Environment

• SDK: looker-sdk 26.4.0 (Python, pip)
• API version: 4.0
• Looker instance: Google Cloud core 26.2
• OS: macOS (darwin/arm64)