Fixes crash when searching for route
Fixes crash when searching for route

Fixes #1333 - Beta 20180802.23 crashes when searching for route with multiple results

The `mapPulley` property is not a UINavigationController and Swift is apparently ornery enough about this sort of thing to crash on us.

OneBusAway/onebusaway-iphone,ualch9/onebusaway-iphone,themonki/onebusaway-iphone,OneBusAway/onebusaway-iphone,themonki/onebusaway-iphone,themonki/onebusaway-iphone,OneBusAway/onebusaway-iphone,ualch9/onebusaway-iphone,OneBusAway/onebusaway-iphone,ualch9/onebusaway-iphone,OneBusAway/onebusaway-iphone,ualch9/onebusaway-iphone,themonki/onebusaway-iphone,ualch9/onebusaway-iphone,themonki/onebusaway-iphone