this seems to end up doing the same as `git fetch origin HEAD` but I can't figure out why -- perhaps someone on this list can help me :)
$ git fetch origin '' From github.com:python/cpython * branch HEAD -> FETCH_HEAD
what I expected was `fatal: Couldn't find remote ref ''` or something of the sort as would be seen when fetching some non-existent branch:
$ git fetch origin wat fatal: Couldn't find remote ref wat
Anthony