This bug occurs with msysgit under mysterious circumstances. We have at
least two Windows machines where "git diff" works correctly but "git
gui" is unable to get the actual diffs. Before commit 584fa9cc, git gui
favoured the user with an infinite message box loop. This is what
584fa9cc should've fixed: display a nice message to the user. Instead I
see the Tcl error message box, complaining about the missing variable
diff_empty_count.
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