Overlay parent can't be null anymore

lib/android/app/src/main/java/com/reactnativenavigation/presentation/OverlayManager.java

@@ -1,6 +1,5 @@
 package com.reactnativenavigation.presentation;
 
-import android.support.annotation.Nullable;
 import android.view.ViewGroup;
 
 import com.reactnativenavigation.utils.CommandListener;
@@ -11,14 +10,10 @@ import java.util.HashMap;
 public class OverlayManager {
     private final HashMap<String, ViewController> overlayRegistry = new HashMap<>();
 
-    public void show(@Nullable ViewGroup root, ViewController overlay, CommandListener listener) {
-        if (root == null) {
-            listener.onError("Can't show Overlay before setRoot is called. This will be resolved in #3899");
-            return;
-        }
+    public void show(ViewGroup overlaysContainer, ViewController overlay, CommandListener listener) {
         overlayRegistry.put(overlay.getId(), overlay);
         overlay.setOnAppearedListener(() -> listener.onSuccess(overlay.getId()));
-        root.addView(overlay.getView());
+        overlaysContainer.addView(overlay.getView());
     }
 
     public void dismiss(String componentId, CommandListener listener) {