createdb.py: don't insist on route id having a mapping
createdb.py: don't insist on route id having a mapping

Some transit feeds (I'm looking at you, Edmonton) seem to have routes without
trips, which means that they don't have mapping. Fix this. Incidentally,
having trouble getting long/short names from these routes. Ignore them for
now, will fix later.

wlach/routez,wlach/routez