remote: insert refspecs with no rhs in FETCH_HEADcmn/fetch-spec-fetchhead

When a refspec contains no rhs and thus won't cause an explicit update,
we skip all the logic, but that means that we don't update FETCH_HEAD
with it, which is what the implicit rhs is.

Add another bit of logic which puts those remote heads in the list of
updates so we put them into FETCH_HEAD.

0 files changed, 0 insertions, 0 deletions