message: Don't assume that diffs will have an appropriate child node
  Fixes
  This is a regression from react-sdk v1.5.0 where the diff feature was added in the first place. It only affects lists.
diff: @@ -77,6 +77,8 @@ function findRefNodes(root, route, isAddition) {
  const end = isAddition ? route.length - 1 : route.length;
  for (let i = 0; i < end; ++i) {
  refParentNode = refNode;
  + // Lists don't have appropriate child nodes we can use.
  + if (!refNode.childNodes[route[i]]) continue;
  refNode = refNode.childNodes[route[i]];
  }
  return {refNode, refParentNode};
  