Fix incorrect detection of comment forms in nodes
Detection of mollom on comment form on nodes does not seem to be working right. The error was shown on a page where there is no comment form and only a login form was shown.
The system is looking for a mollom field in a comment/reply/nid page on a detected node but it was not checking whether commenting is actually enabled. We will change it to first check for a comment form in the page and then check for mollom field.