dont crash on resume setting the resource name

Author: bradmartin

src/fab.android.ts

@@ -82,6 +82,9 @@ export class Fab extends FloatingActionButtonBase {
 
   [iconProperty.setNative](value: any) {
     let iconDrawable = null;
+    if (!value) {
+      return;
+    }
 
     if (ImageSource.isFileOrResourcePath(value)) {
       iconDrawable = ImageSource.fromFileOrResource(value);

src/package.json

@@ -1,6 +1,6 @@
 {
   "name": "nativescript-floatingactionbutton",
-  "version": "4.1.1",
+  "version": "4.1.2",
   "description":
     "A NativeScript plugin for Material Design Floating Action Button.",
   "main": "fab",