Merge pull request #1767 from petermarcoen/JENKINS-2327

[FIXED JENKINS-2327] Do not display 'No changes' if changelog calcula…

core/src/main/resources/hudson/model/AbstractBuild/changes.jelly

@@ -31,7 +31,17 @@ THE SOFTWARE.
     <st:include page="sidepanel.jelly" />
     <l:main-panel>
       <t:buildCaption>${%Changes}</t:buildCaption>
-      <st:include page="index.jelly" it="${it.changeSet}" />
+      <j:choose>
+        <j:when test="${it.hasChangeSetComputed()}">
+          <st:include page="index.jelly" it="${it.changeSet}" />
+        </j:when>
+        <j:when test="${it.building}">
+          ${%Not yet determined}
+        </j:when>
+        <j:otherwise>
+          ${%Failed to determine} (<a href="console">${%log}</a>)
+        </j:otherwise>
+      </j:choose>
     </l:main-panel>
   </l:layout>
 </j:jelly>