(JS) update: throw error if the listener for event listener is not a function
(JS) update: throw error if the listener for event listener is not a function

dukhanov/cordova-plugin-googlemaps,mapsplugin/cordova-plugin-googlemaps,dukhanov/cordova-plugin-googlemaps,wf9a5m75/phonegap-googlemaps-plugin,dukhanov/cordova-plugin-googlemaps,mapsplugin/cordova-plugin-googlemaps,wf9a5m75/phonegap-googlemaps-plugin,wf9a5m75/phonegap-googlemaps-plugin,mapsplugin/cordova-plugin-googlemaps