add isBuildTab and isJobTab helpers

assets/javascripts/app/templates/repositories/tabs.hbs

@@ -11,20 +11,20 @@
   <li id="tab_branches" {{bindAttr class="view.classBranches"}}>
     <h5><a {{bindAttr href="view.urlBranches"}}>{{t repositories.tabs.branches}}</a></h5>
   </li>
-  {{#with controller.build}}
-    {{#if isLoaded}}
+  {{#if view.isBuildTab}}
+    {{#with controller.build}}
       <li id="tab_build" {{bindAttr class="view.classBuild"}}>
         <h5><a {{bindAttr href="view.urlBuild"}}>{{t repositories.tabs.build}} #{{number}}</a></h5>
       </li>
-    {{/if}}
-  {{/with}}
-  {{#with controller.job}}
-    {{#if isLoaded}}
+    {{/with}}
+  {{/if}}
+  {{#if view.isJobTab}}
+    {{#with controller.job}}
       <li id="tab_job" {{bindAttr class="view.classJob"}}>
         <h5><a {{bindAttr href="view.urlJob"}}>{{t repositories.tabs.job}} #{{number}}</a></h5>
       </li>
-    {{/if}}
-  {{/with}}
+    {{/with}}
+  {{/if}}
 </ul>
 
 <div id="tools">

assets/javascripts/app/views/tabs.coffee

@@ -5,6 +5,15 @@
     toggleTools: ->
       $('#tools .pane').toggle()
 
+    isBuildTab: (->
+      tab = @getPath('controller.tab')
+      (tab == 'build' || tab == 'job') && @getPath('controller.build.isLoaded')
+    ).property('controller.tab', 'controller.build.isLoaded')
+
+    isJobTab: (->
+      @getPath('controller.tab') == 'job' && @getPath('controller.job.isLoaded')
+    ).property('controller.tab', 'controller.job.isLoaded')
+
     # hrm. how to parametrize bindAttr?
     classCurrent: (->
       'active' if @getPath('controller.tab') == 'current'