set the initial value so that we can diagnose the failure better.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@8502 71c3de6d-444a-0410-be80-ed276b4c234a

war/resources/scripts/hudson-behavior.js

@@ -416,7 +416,7 @@ var hudsonRules = {
     "FORM" : function(form) {
         // add the hidden 'json' input field, which receives the form structure in JSON
         var div = document.createElement("div");
-        div.innerHTML = "<input type=hidden name=json>";
+        div.innerHTML = "<input type=hidden name=json value=init>";
         form.appendChild(div);
         
         form.onsubmit = function() { buildFormTree(this) };