diff -u b/core/misc/ajax.js b/core/misc/ajax.js
--- b/core/misc/ajax.js
+++ b/core/misc/ajax.js
@@ -1054,8 +1054,10 @@
           intermediateWrapper.append(value);
         }
         if (!intermediateWrapper && value.nodeType !== 1) {
-          intermediateWrapper = createWrapper();
-          intermediateWrapper.append(value);
+          if ($.trim(value).lenght > 0) {
+            intermediateWrapper = createWrapper();
+            intermediateWrapper.append(value);
+          }
         }
         if (!intermediateWrapper && value.nodeType === 1) {
           $new_content.append(value);