Update geoip.py (#1896)
Update geoip.py (#1896)

Added error handling in case `IP_ADDR_LOOKUP.get(addr)` fails.
CTFd/CTFd,ajvpot/CTFd,isislab/CTFd,CTFd/CTFd,isislab/CTFd,ajvpot/CTFd,CTFd/CTFd,ajvpot/CTFd,isislab/CTFd,ajvpot/CTFd,isislab/CTFd,CTFd/CTFd