[closetag addon] Allow typing '/' if there's no matching open tag

addon/edit/closetag.js

@@ -82,6 +82,7 @@
 
     var tagName = state.context && state.context.tagName;
     if (tagName) cm.replaceSelection("/" + tagName + ">", "end");
+    else return CodeMirror.Pass;
   }
 
   function indexOf(collection, elt) {