CommitInfo: Clear RevisionInfo if no real revision

[mstv]

Proposed changes

• For artificial commits, clear the lower panel of the CommitInfo

Screenshots

Before

After

Test methodology

• manual

Test environment(s)

• Git Extensions 33.33.33
• Build b841ac9
• Git 2.35.1.windows.1
• Microsoft Windows NT 10.0.19044.0
• .NET 5.0.12
• DPI 96dpi (no scaling)

Merge strategy

I agree that the maintainer squash merge this PR (if the commit message is clear).

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

[gerhardol]

I think this is good info also for artificial commits

[mstv]

I think this is good info also for artificial commits

I guess you mean to display the info of the current checkout. Then the CommitInfo must be updated accordingly.
Though "Contained in" cannot really be true for artificial commits.
(The empty space might be filled with an edit field for the commit message in the future.)

Currently, it shows the info for the previously selected commit, which can be totally unrelated, i.e. wrong.