Fix last commit API with empty repository

[pulltheflower]

Related to issue OpenCSGs/csghub#768

• Fix the bug that call the last_commit API in an empty repository will case a panic.

MR Summary:

The summary is added by @codegpt.

The Merge Request addresses a bug related to the last_commit API call on an empty repository, which previously caused a panic. The fix involves ensuring the API handles empty repositories gracefully without crashing. Key updates include:

1. Modified the GetRepoLastCommit function in commit.go to check if the response and the commit object are not nil before proceeding.
2. Updated the SDKModelInfo function in model.go to handle cases where the last commit might be nil, preventing potential null pointer exceptions by introducing a check before assigning the commit ID.

[starship-github]

MR Evaluation:

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After evaluation, the code changes in the Merge Request get score: 88-90.

Analysis for the evaluation score:

• The code change may not include corresponding unit tests.
• The code change may not include corresponding integration testing.

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