Fix kotlin nullable errors in ThemePicker am: 48b4225329

Original change: https://android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/2702153

Change-Id: I5049541131a95563c2d586214ca8bb5b32164613
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/src/com/android/customization/picker/color/ui/binder/ColorSectionViewBinder.kt b/src/com/android/customization/picker/color/ui/binder/ColorSectionViewBinder.kt
index 05b0916..9e232d7 100644
--- a/src/com/android/customization/picker/color/ui/binder/ColorSectionViewBinder.kt
+++ b/src/com/android/customization/picker/color/ui/binder/ColorSectionViewBinder.kt
@@ -95,7 +95,7 @@
                 LayoutInflater.from(view.context)
                     .inflate(R.layout.color_option_no_background, view, false)
             item.payload?.let { ColorOptionIconBinder.bind(itemView as ViewGroup, item.payload) }
-            val optionSelectedView = itemView.findViewById<ImageView>(R.id.option_selected)
+            val optionSelectedView = itemView.requireViewById<ImageView>(R.id.option_selected)
 
             lifecycleOwner.lifecycleScope.launch {
                 lifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {