[FIXED JENKINS-9689]

backporting this from the trunk.

changelog.html

@@ -85,6 +85,9 @@ Upcoming changes</a>
   <li class=bug>
     Fixed the initialization order of plugins
     (<a href="http://issues.jenkins-ci.org/browse/JENKINS-9960">issue 9960</a>)
+  <li class=bug>
+    Label/node tree is not visible in multi-configuration project config page
+    (<a href="http://issues.jenkins-ci.org/browse/JENKINS-9689">issue 9689</a>)
   <li class=rfe>
     <tt>LDAPBindSecurityRealm.groovy</tt> can be now overridden in <tt>$JENKINS_HOME</tt> if it exists.
   <li class=rfe>

war/src/main/webapp/scripts/hudson-behavior.js

@@ -453,6 +453,7 @@ function renderOnDemand(e,callback,noBehaviour) {
         }
         Element.remove(e);
 
+        t.responseText.evalScripts();
         Behaviour.applySubtree(elements,true);
 
         if (callback)   callback(t);