Check to make sure route objects exist before adding them to the array
Check to make sure route objects exist before adding them to the array

Fixes #826 - Crash in OBAStopV2

themonki/onebusaway-iphone,themonki/onebusaway-iphone,ualch9/onebusaway-iphone,ualch9/onebusaway-iphone,cathy810218/onebusaway-iphone,OneBusAway/onebusaway-iphone,themonki/onebusaway-iphone,ualch9/onebusaway-iphone,OneBusAway/onebusaway-iphone,themonki/onebusaway-iphone,cathy810218/onebusaway-iphone,ualch9/onebusaway-iphone,ualch9/onebusaway-iphone,OneBusAway/onebusaway-iphone,OneBusAway/onebusaway-iphone,themonki/onebusaway-iphone,cathy810218/onebusaway-iphone,cathy810218/onebusaway-iphone,OneBusAway/onebusaway-iphone