fix issue #2788 - hide menu when the user is not inside a project

app/coffee/app.coffee

@@ -512,6 +512,8 @@ init = ($log, $rootscope, $auth, $events, $analytics, $translate, $location, $na
 
         if next.params.pslug
             projectService.setProject(next.params.pslug)
+        else
+            projectService.cleanProject()
 
         if next.title
             $translate(next.title).then (text) => $appTitle.set(text)

app/modules/services/project.service.coffee

@@ -28,6 +28,12 @@ class ProjectService
 
             @.fetchProject()
 
+    cleanProject: () ->
+        @._pslug = null
+        @._project = null
+        @._section = null
+        @._sectionsBreadcrumb = Immutable.List()
+
     fetchProject: () ->
         return @projectsService.getProjectBySlug(@._pslug).then (project) =>
             @._project = project