Exit early if currentShadowNode cannot be casted

Summary:
This diff fixes the bug T127619309 by exit early during calculateTransformedFrames if currentShadowNode cannot be casted

This is a bug that fired in fb4a but we didn't have a way to reproduce locally.
We are going to release this and enable feature flag with a MC

changelog: [internal] internal

Reviewed By: sammy-SC

Differential Revision: D38280674

fbshipit-source-id: 1c42c17678d8473564e4075a78d3c688efed1a23

ReactCommon/react/renderer/core/LayoutableShadowNode.cpp

@@ -30,6 +30,11 @@ static LayoutableSmallVector<Rect> calculateTransformedFrames(
   for (int i = size - 1; i >= 0; --i) {
     auto currentShadowNode =
         traitCast<LayoutableShadowNode const *>(shadowNodeList.at(i));
+
+    if (!currentShadowNode) {
+      return {};
+    }
+
     auto currentFrame = currentShadowNode->getLayoutMetrics().frame;
 
     if (policy.includeTransform) {
@@ -166,6 +171,11 @@ LayoutMetrics LayoutableShadowNode::computeRelativeLayoutMetrics(
   auto transformedFrames = shouldCalculateTransformedFrames
       ? calculateTransformedFrames(shadowNodeList, policy)
       : LayoutableSmallVector<Rect>();
+
+  if (transformedFrames.empty()) {
+    return EmptyLayoutMetrics;
+  }
+
   auto layoutMetrics = descendantLayoutableNode->getLayoutMetrics();
   auto &resultFrame = layoutMetrics.frame;
   resultFrame.origin = {0, 0};