Code: Fixed highlighting issues when no code language set

For #4917

Author: ssddanbrown

resources/js/code/index.mjs

@@ -48,14 +48,16 @@ function highlightElem(elem) {
     const content = elem.textContent.trimEnd();
 
     let langName = '';
+    let innerCodeDirection = '';
     if (innerCodeElem !== null) {
         langName = innerCodeElem.className.replace('language-', '');
+        innerCodeDirection = innerCodeElem.getAttribute('dir');
     }
 
     const wrapper = document.createElement('div');
     elem.parentNode.insertBefore(wrapper, elem);
 
-    const direction = innerCodeElem.getAttribute('dir') || elem.getAttribute('dir') || '';
+    const direction = innerCodeDirection || elem.getAttribute('dir') || '';
     if (direction) {
         wrapper.setAttribute('dir', direction);
     }