fix bug in wizard where invalid input may cause an exception. fixes #121
fix bug in wizard where invalid input may cause an exception. fixes #121

by making the typo detection algorithm more robust against wrong input.

dex2000/overpass-turbo,elbakai/overpass-turbo,elbakai/overpass-turbo,Secretmapper/overpass-turbo,Secretmapper/overpass-turbo,dex2000/overpass-turbo