Fix JS error on homepage (this._flash.addOverlay is not a function)

plugins/customindex/views/default/customindex/globesplash.js

@@ -120,6 +120,9 @@ function letsdothisloop(delay) {
 };
 
 function openLocation(lng, lat, username, location, displayname, title, comment, linkname) {
+	if (!map1._flash.addOverlay) {
+		return;
+	}
 	if(!pinsonly)
 		clearTimeout(t);
 	var latlng = new FE.LatLng(lat,lng);