emit empty repo for refs to within the same repo, in the python grapher (fixes 404s)
emit empty repo for refs to within the same repo, in the python grapher (fixes 404s)

alexsaveliev/srclib-python,alexsaveliev/srclib-python,techdragon/srclib-python,alexsaveliev/srclib-python,techdragon/srclib-python,sourcegraph/srclib-python,techdragon/srclib-python