fix NPE if mapview is null somehow
fix NPE if mapview is null somehow


rksh/wigle-wifi-wardriving,DEVPAR/wigle-wifi-wardriving,rksh/wigle-wifi-wardriving,DEVPAR/wigle-wifi-wardriving,wiglenet/wigle-wifi-wardriving,rksh/wigle-wifi-wardriving,bobzilladev/wigle-wifi-wardriving,wiglenet/wigle-wifi-wardriving,bobzilladev/wigle-wifi-wardriving,alexws54tk/wigle-wifi-wardriving,DEVPAR/wigle-wifi-wardriving,alexws54tk/wigle-wifi-wardriving,alexws54tk/wigle-wifi-wardriving,wiglenet/wigle-wifi-wardriving,bobzilladev/wigle-wifi-wardriving