only create OSMMapType when google maps is loaded
only create OSMMapType when google maps is loaded

miguelpaz/StoryMapJS,1modm/StoryMapJS,makinacorpus/StoryMapJS,jorol/StoryMapJS,cr3ative/StoryMapJS,BenHeubl/StoryMapJS,BenHeubl/StoryMapJS,miguelpaz/StoryMapJS,wangjun/StoryMapJS,jorol/StoryMapJS,BenHeubl/StoryMapJS,jorol/StoryMapJS,wangjun/StoryMapJS,cr3ative/StoryMapJS,cr3ative/StoryMapJS,miguelpaz/StoryMapJS,wangjun/StoryMapJS,1modm/StoryMapJS,1modm/StoryMapJS,makinacorpus/StoryMapJS,jorol/StoryMapJS,wangjun/StoryMapJS,cr3ative/StoryMapJS,makinacorpus/StoryMapJS,1modm/StoryMapJS,BenHeubl/StoryMapJS