[MOD-2440] Android: Ti.map crashes when adding / selecting annotations

    [WARN]  W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.model.Marker.remove()' on a null object reference
    [WARN]  W/System.err: 	at ti.map.TiUIMapView.addAnnotation(TiUIMapView.java:474)
    [WARN]  W/System.err: 	at ti.map.TiUIMapView.addAnnotations(TiUIMapView.java:489)
    [WARN]  W/System.err: 	at ti.map.TiUIMapView.updateAnnotations(TiUIMapView.java:498)
    [WARN]  W/System.err: 	at ti.map.TiUIMapView.propertyChanged(TiUIMapView.java:288)
    [WARN]  W/System.err: 	at org.appcelerator.kroll.KrollProxy.firePropertyChanged(KrollProxy.java:969)
    [WARN]  W/System.err: 	at org.appcelerator.kroll.KrollProxy.onPropertyChanged(KrollProxy.java:1058)
    [WARN]  W/System.err: 	at org.appcelerator.kroll.runtime.v8.V8Function.nativeInvoke(Native Method)
    [WARN]  W/System.err: 	at org.appcelerator.kroll.runtime.v8.V8Function.callSync(V8Function.java:55)
    [WARN]  W/System.err: 	at org.appcelerator.kroll.runtime.v8.V8Function.call(V8Function.java:41)
    [WARN]  W/System.err: 	at ti.modules.titanium.TitaniumModule$Timer.run(TitaniumModule.java:166)
    [WARN]  W/System.err: 	at android.os.Handler.handleCallback(Handler.java:751)
    [WARN]  W/System.err: 	at android.os.Handler.dispatchMessage(Handler.java:95)
    [WARN]  W/System.err: 	at android.os.Looper.loop(Looper.java:173)
    [WARN]  W/System.err: 	at android.app.ActivityThread.main(ActivityThread.java:6459)
    [WARN]  W/System.err: 	at java.lang.reflect.Method.invoke(Native Method)
    [WARN]  W/System.err: 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:938)
    [WARN]  W/System.err: 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:828)
    

    var Map = require('ti.map');
    var win = Titanium.UI.createWindow();
    var mapview = Map.createView({
    	bottom: 0,
    	right: 0,
    	width: Ti.UI.FILL,
    	height: Ti.UI.FILL,
    	rotateEnabled: true,
    	mapType: Map.MUTED_STANDARD_TYPE,
    	showsPointsOfInterest: false,
    	userLocation: true,
    });
    var ann = [];	// store annotations
    
    function setData() {
    	for (var i = 0; i < 10; i++) {
    		ann.push(Map.createAnnotation({
    			title: 'Title',
    			subtitle: 'subtitle',
    			latitude: Math.random() * 10 + 40,
    			longitude: Math.random() * 10,
    		}));
    	}
    	mapview.setAnnotations(ann);
    }
    setData();
    
    
    var btn = Ti.UI.createButton({
    	title: "add again",
    	bottom: 40
    });
    var btn2 = Ti.UI.createButton({
    	title: "add new",
    	bottom: 0
    });
    var btn3 = Ti.UI.createButton({
    	title: "set",
    	bottom: 80
    });
    btn.addEventListener("click", function() {
    	// remove and add existing annotation
    	mapview.removeAllAnnotations();
    	mapview.addAnnotation(ann[0]);
    })
    
    btn2.addEventListener("click", function() {
    	// create new annotation and set it
    	var anno = Map.createAnnotation({
    		title: 'Title',
    		subtitle: 'subtitle',
    		latitude: Math.random() * 10 + 40,
    		longitude: Math.random() * 10,
    	})
    	mapview.setAnnotations([anno]);
    })
    
    btn3.addEventListener("click", function() {
    	// reset existing annotation
    	mapview.setAnnotations([ann[0]]);
    })
    win.add(btn);
    win.add(btn2);
    win.add(btn3);
    win.add(mapview);
    win.open();