git-gui: fix inability to quit after closing another instance #91
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If you open 2 git gui instances in the same directory, then close one of them and try to close the other, an error message pops up, saying: 'error renaming ".git/GITGUI_BCK": no such file or directory', and it is no longer possible to close the window ever.
Fix by catching this error, and proceeding even if the file no longer exists.