Fix CSV diff panic if the file was deleted from both branches #22947
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Close #22946
If a CSV file was deleted from both branches, then baseReader and headReader are nil, no need to "diff" them.
The UI will show a "deleted" change correctly.
ps: This is a quick fix. If you want to see the "deleted content", it needs more work to fine tune. I think it's good enough for a fix, since the file has been deleted from both side already.