fix: fallback to default behaviour when fragment not found

android/src/main/java/com/swmansion/rnscreens/ScreenContainer.kt

@@ -165,7 +165,7 @@ open class ScreenContainer<T : ScreenFragment>(context: Context?) : ViewGroup(co
             try {
                 FragmentManager.findFragment<Fragment>(rootView).childFragmentManager
             } catch (ex: IllegalStateException) {
-                throw IllegalStateException("Failed to find fragment for React Root View")
+                context.supportFragmentManager
             }
         }
     }