Update PluginMap.java
Update PluginMap.java

Prevent null pointer crash
wf9a5m75/phonegap-googlemaps-plugin,dukhanov/cordova-plugin-googlemaps,dukhanov/cordova-plugin-googlemaps,mapsplugin/cordova-plugin-googlemaps,dukhanov/cordova-plugin-googlemaps,wf9a5m75/phonegap-googlemaps-plugin,wf9a5m75/phonegap-googlemaps-plugin,mapsplugin/cordova-plugin-googlemaps,mapsplugin/cordova-plugin-googlemaps