Merge pull request #2156 from CaLouro/null-safe-Get.engine

Null safe Get.engine

@@ -1059,7 +1059,7 @@ extension GetNavigationExt on GetInterface {
   /// Your entire application will be rebuilt, and touch events will not
   /// work until the end of rendering.
   Future<void> forceAppUpdate() async {
-    await engine!.performReassemble();
+    await engine.performReassemble();
   }
 
   void appUpdate() => _getxController.update();
@@ -1173,12 +1173,9 @@ extension GetNavigationExt on GetInterface {
     return _theme;
   }
 
-  ///The current [WidgetsBinding]
-  WidgetsBinding? get engine {
-    if (WidgetsBinding.instance == null) {
-      WidgetsFlutterBinding();
-    }
-    return WidgetsBinding.instance;
+  /// The current null safe [WidgetsBinding]
+  WidgetsBinding get engine {
+    return WidgetsFlutterBinding.ensureInitialized();
   }
 
   /// The window to which this binding is bound.

@@ -199,7 +199,7 @@ class GetCupertinoApp extends StatelessWidget {
           Get.routeInformationParser = null;
         },
         initState: (i) {
-          Get.engine!.addPostFrameCallback((timeStamp) {
+          Get.engine.addPostFrameCallback((timeStamp) {
             onReady?.call();
           });
           if (locale != null) Get.locale = locale;

@@ -215,7 +215,7 @@ class GetMaterialApp extends StatelessWidget {
       initState: (i) {
         // Get.routerDelegate = routerDelegate;
         // Get.routeInformationParser = routeInformationParser;
-        Get.engine!.addPostFrameCallback((timeStamp) {
+        Get.engine.addPostFrameCallback((timeStamp) {
           onReady?.call();
         });
         if (locale != null) Get.locale = locale;