Changes

Return null from GitRefsDatasource.getDigest if an error is thrown. This is consistent with GitRefsDatasource.getReleases and means that Renovate will register a package warning instead of logging an error when a repository specifies a dependency on a git repo that doesn't exist.

Context

Please select one of the below:

• This closes relates to an existing Issue, Ref: Make abortOnError packageRules-configurable, not hostRules #21757
• This doesn't close an Issue, but I accept the risk that this PR may be closed if maintainers disagree with its opening or implementation

AI assistance disclosure

Did you use AI tools to create any part of this pull request?

Please select one option and, if yes, briefly describe how AI was used (e.g., code, tests, docs) and which tool(s) you used.

• No — I did not use AI for this contribution.
• Yes — minimal assistance (e.g., IDE autocomplete, small code completions, grammar fixes).
• Yes — substantive assistance (AI generated non‑trivial portions of code, tests, or documentation).
• Yes — other (please describe):

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

The public repository: