Only show tree status if the tree isn't open.

Tools/GardeningServer/ui/ct-tree-status.html

 <!--
 Copyright 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
-<polymer-element name="ct-tree-status" attributes="project status">
+<polymer-element name="ct-tree-status">
   <template>
-    <style>
-      :host {
-        display: block;
-        whitespace: nowrap;
-        overflow: hidden;
-        text-overflow: ellispis;
-      }
+    <template if="{{ message }}">
+      <style>
+        :host {
+          display: block;
+          whitespace: nowrap;
+          overflow: hidden;
+          text-overflow: ellispis;
+        }
 
-      :host([status=throttled]) {
-        background-color: khaki;
-      }
+        :host([status=throttled]) {
+          background-color: khaki;
+        }
 
-      :host([status=closed]) {
-        color: white;
-        background-color: tomato;
-      }
-    </style>
-    {{project}}: {{message}}
+        :host([status=closed]) {
+          color: white;
+          background-color: tomato;
+        }
+      </style>
+      {{project}}: {{message}}
+    </template>
   </template>
   <script>
     Polymer({
       publish: {
+        project: '',
+        message: '',
         status: {
-          value: 'unknown',
+          value: 'open',
           reflect: true,
         },
       },
 
       update: function() {
         var url = treestatus.urlByName(this.project);
         return net.json(url).then(function(response) {
           this.updateStatus(response);
         }.bind(this));
       },
 
       updateStatus: function(status) {
         if (status.can_commit_freely) {
-          this.message = 'Tree is open';
+          this.message = '';
           this.status = 'open';
+          return;
+        }
+
+        this.message = status.message + ' by ' + status.username;
+        var responseLowerCase = status.message.toLowerCase();
+        if (responseLowerCase.indexOf('throttled') != -1) {
+          this.status = 'throttled';
+        } else if (responseLowerCase.indexOf("closed") != -1) {
+          this.status = 'closed';
         } else {
-          this.message = status.message + ' by ' + status.username;
-          var responseLowerCase = status.message.toLowerCase();
-          if (responseLowerCase.indexOf('throttled') != -1) {
-            this.status = 'throttled';
-          } else if (responseLowerCase.indexOf("closed") != -1) {
-            this.status = 'closed';
-          } else {
-            this.status = 'unknown';
-          }
+          this.status = 'unknown';
         }
       },
     });
   </script>
 </polymer-element>