print slightly better message if git nav-upstream is not called in git repo
Currently, the command will print following message twice when not called in git repo. ``` fatal: not a git repository (or any parent up to mount point /google) Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set). ``` Bug: 339231299 Change-Id: Iab05e037a81b7e15dcc011d78480cd9ace7c7e36 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5544438 Commit-Queue: Yiwei Zhang <yiwzhang@google.com> Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>changes/38/5544438/4
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