git-gui: Only populate a fetch or push if we have an action.
Don't offer to fetch from a remote unless we have at least one Pull:
line in its .git/remotes/<name> file or at least one configuration
value for remote.<name>.fetch. Ditto for push.
Users shouldn't be fetching or pushing branch groups unless they
have them configured; anything else is just crazy.
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>
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