upgrader: Fix upgrade from osTicket 1.6
upgrade: Fix nasty message in footer on 1.6

This happens when upgrading from 1.6, the company information does not yet
exist (neither do the form tables)

Properly escape company name for display
Merge pull request #614 from greezybacon/issue/16-181-upgrade

upgrader: Fix upgrade from osTicket 1.6

Reviewed-By: Peter Rotich <peter@osticket.com>