workspace: Fix an npe

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.ViewGroup.removeView(android.view.View)' on a null object reference
	at com.android.launcher3.Workspace.removeAllWorkspaceScreens(Workspace.java:608)
	at com.android.launcher3.Launcher.startBinding(Launcher.java:2203)
	at com.android.launcher3.model.BaseLoaderResults$WorkspaceBinder.lambda$bind$0(BaseLoaderResults.java:200)
	at com.android.launcher3.model.BaseLoaderResults$WorkspaceBinder$$ExternalSyntheticLambda7.execute(Unknown Source:0)
	at com.android.launcher3.model.BaseLoaderResults$WorkspaceBinder.lambda$executeCallbacksTask$9$com-android-launcher3-model-BaseLoaderResults$WorkspaceBinder(BaseLoaderResults.java:260)
	at com.android.launcher3.model.BaseLoaderResults$WorkspaceBinder$$ExternalSyntheticLambda9.run(Unknown Source:4)
	at android.os.Handler.handleCallback(Handler.java:938)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loopOnce(Looper.java:201)
	at android.os.Looper.loop(Looper.java:288)
	at android.app.ActivityThread.main(ActivityThread.java:7871)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:550)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)

Signed-off-by: Pranav <npv12@iitbbs.ac.in>

src/com/android/launcher3/Workspace.java

@@ -605,7 +605,10 @@ public class Workspace extends PagedView<WorkspacePageIndicator>
 
         // Recycle the QSB widget
         if (mQsb != null) {
-            ((ViewGroup) mQsb.getParent()).removeView(mQsb);
+            ViewGroup viewGroup = (ViewGroup) mQsb.getParent();
+            if (viewGroup != null) {
+                viewGroup.removeView(mQsb);
+            }
         }
 
         // Remove the pages and clear the screen models