U4-10227 Users section should start in the user tree

src/Umbraco.Web/Editors/SectionController.cs

@@ -5,6 +5,8 @@ using Umbraco.Web.Models.ContentEditing;
 using Umbraco.Web.Mvc;
 using Umbraco.Web.WebApi;
 using System.Linq;
+using System.Net.Http.Formatting;
+using Umbraco.Web.Trees;
 
 namespace Umbraco.Web.Editors
 {
@@ -15,9 +17,45 @@ namespace Umbraco.Web.Editors
     public class SectionController : UmbracoAuthorizedJsonController
     {
         public IEnumerable<Section> GetSections()
-        {
-            var sections =  Services.SectionService.GetAllowedSections(UmbracoUser.Id);
-            return sections.Select(Mapper.Map<Core.Models.Section, Section>);
+        {
+
+            var sections =  Services.SectionService.GetAllowedSections(Security.GetUserId());
+
+            var sectionModels = sections.Select(Mapper.Map<Core.Models.Section, Section>).ToArray();
+
+            //Check if there are empty dashboards or dashboards that will end up empty based on the current user's access
+            //and add the meta data about them
+            var dashboardHelper = new DashboardHelper(Services.SectionService);
+            //this is a bit nasty since we'll be proxying via the app tree controller but we sort of have to do that
+            //since tree's by nature are controllers and require request contextual data.
+            var appTreeController = new ApplicationTreeController
+            {
+                ControllerContext = ControllerContext
+            };
+            var dashboards = dashboardHelper.GetDashboards(Security.CurrentUser);
+            //now we can add metadata for each section so that the UI knows if there's actually anything at all to render for
+            //a dashboard for a given section, then the UI can deal with it accordingly (i.e. redirect to the first tree)
+            foreach (var section in sectionModels)
+            {
+                var hasDashboards = false;
+                IEnumerable<Tab<DashboardControl>> dashboardsForSection;
+                if (dashboards.TryGetValue(section.Alias, out dashboardsForSection))
+                {
+                    if (dashboardsForSection.Any())                    
+                        hasDashboards = true;
+                }
+
+                if (hasDashboards == false)
+                {
+                    //get the first tree in the section and get it's root node route path
+                    var sectionTrees = appTreeController.GetApplicationTrees(section.Alias, null, null).Result;
+                    section.RoutePath = sectionTrees.IsContainer == false 
+                        ? sectionTrees.RoutePath 
+                        : sectionTrees.Children[0].RoutePath;
+                }
+            }
+
+            return sectionModels;
         }
 
         public IEnumerable<Section> GetAllSections()