Preparations for exceptions on git error (part 4 of 4)

[mstv]

Some of the preparations for #9056 contributed by @gerhardol

Proposed changes

• GetMergedBranchesAsync: Ignore (git exit code and) StandardError
• GetRemotesAsync: Return empty list on non-zero git exit code
• GetRefs: Return empty list on non-zero git exit code

I am not really convinced that we should swallow errors from these commands. That's why:

• Add TODOs for later generic handling of StandardError

Screenshots

not affected

Test methodology

• NUnit tests
• manual

Test environment(s)

• Git Extensions 33.33.33
• Build e6c851c
• Git 2.31.1.windows.1
• Microsoft Windows NT 10.0.19042.0
• .NET 5.0.7
• DPI 96dpi (no scaling)

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✒️ I contribute this code under The Developer Certificate of Origin.

[mstv]

I have added TODOs for a later generic handling of StandardError in a follow-up.

[RussKie]

👍