Fixes tab duplication on change-request view

Thanks @jtnord.

Author: alecharp

src/main/resources/jenkins/branch/BaseView/main.jelly

@@ -4,7 +4,9 @@
   <j:set var="currentView" value="${it}"/>
   <l:userExperimentalFlag var="newDashboardPage" flagClassName="jenkins.model.experimentalflags.NewDashboardPageUserExperimentalFlag"/>
   <j:if test="${items.isEmpty()}">
-    <st:include it="${it.owner.viewsTabBar}" page="viewTabs"/>
+    <j:if test="${!newDashboardPage}">
+      <st:include it="${it.owner.viewsTabBar}" page="viewTabs"/>
+    </j:if>
     <st:include it="${it}" page="noJob.jelly"/>
   </j:if>
   <j:if test="${!items.isEmpty()}">