fixed #162.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@1157 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/JobCollection.java

@@ -90,6 +90,26 @@ public abstract class JobCollection extends AbstractModelObject {
             return that.lastChange.compareTo(this.lastChange);
         }
     }
+
+    /**
+     * Does this {@link JobCollection} has any associated user information recorded?
+     */
+    public final boolean hasPeople() {
+        for (Job job : getJobs()) {
+            if (job instanceof Project) {
+                Project p = (Project) job;
+                for (Build build : p.getBuilds()) {
+                    for (Entry entry : build.getChangeSet()) {
+                        User user = entry.getAuthor();
+                        if(user!=null)
+                            return true;
+                    }
+                }
+            }
+        }
+        return false;
+    }
+
     /**
      * Gets the users that show up in the changelog of this job collection.
      */

core/src/main/resources/hudson/model/JobCollection/sidepanel.jelly

@@ -13,7 +13,9 @@
       <l:isAdmin>
         <l:task icon="images/24x24/new-package.gif" href="newJob" title="New Job" />
         <l:task icon="images/24x24/setting.gif" href="${rootURL}/manage" title="Manage Hudson" />
-        <l:task icon="images/24x24/user.gif" href="people" title="People" />
+        <j:if test="${it.hasPeople()}">
+          <l:task icon="images/24x24/user.gif" href="people" title="People" />
+        </j:if>
         <st:include page="sidepanel2.jelly" />
       </l:isAdmin>
     </l:tasks>