Item12515: don't crap out because there is no LSC if the request is coming from AJAX; it's not helpful

git-svn-id: http://svn.foswiki.org/trunk@16774 0b4bb1d4-4e5a-0410-9cc4-b2b747904278
Item12515: add basic html and js to retrieve and display the .spec

git-svn-id: http://svn.foswiki.org/trunk@16775 0b4bb1d4-4e5a-0410-9cc4-b2b747904278