Revert "perf(vnode): remove unneeded length check"

This reverts commit 1820e41.

Author: Varixo

packages/qwik/src/core/client/vnode.ts

@@ -1556,7 +1556,9 @@ const processVNodeData = (
   let nextToConsumeIdx = 0;
   let ch = 0;
   let peekCh = 0;
-  const getChar = (idx: number) => vData.charCodeAt(idx);
+  const getChar = (idx: number) => {
+    return idx < vData.length ? vData.charCodeAt(idx) : 0;
+  };
   const peek = () => {
     if (peekCh !== 0) {
       return peekCh;