ui: Only try and load sessions and coordinates if the node exists (#8305)

ui-v2/app/routes/dc/nodes/show.js

@@ -12,8 +12,12 @@ export default Route.extend({
     const name = params.name;
     return hash({
       item: this.repo.findBySlug(name, dc, nspace),
-      sessions: this.sessionRepo.findByNode(name, dc, nspace),
-      tomography: this.coordinateRepo.findAllByNode(name, dc),
+    }).then(model => {
+      return hash({
+        ...model,
+        sessions: this.sessionRepo.findByNode(name, dc, nspace),
+        tomography: this.coordinateRepo.findAllByNode(name, dc),
+      });
     });
   },
   setupController: function(controller, model) {

ui-v2/app/templates/dc/nodes/show.hbs

@@ -1,5 +1,7 @@
 {{title item.Node}}
 <EventSource @src={{item}} @onerror={{action "error"}} />
+<EventSource @src={{sessions}} />
+<EventSource @src={{tomography}} />
 <AppView @class="node show">
     <BlockSlot @name="notification" as |status type|>
       {{!TODO: Move sessions to its own folder within nodes }}