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appengine/swarming/elements/res/imp/botlist/bot-list.html

Index: appengine/swarming/elements/res/imp/botlist/bot-list.html
diff --git a/appengine/swarming/elements/res/imp/botlist/bot-list.html b/appengine/swarming/elements/res/imp/botlist/bot-list.html
index 14ae82a352c9366aa465d674c8ab5272fbcc2a88..6462b9fc069a95ef8ae6d73b9c3fa36721dc0292 100644
--- a/appengine/swarming/elements/res/imp/botlist/bot-list.html
+++ b/appengine/swarming/elements/res/imp/botlist/bot-list.html
@@ -65,7 +65,6 @@
       client_id="[[client_id]]"
       auth_headers="{{_auth_headers}}"
       signed_in="{{_signed_in}}"
-
       busy="[[_busy]]"
       name="Swarming Bot List">
 
@@ -302,7 +301,13 @@
               " ago";
         }
         if (bot.quarantined) {
-          return "Quarantined: " + this._attribute(bot, "quarantined");
+          var msg = this._state(bot, "quarantined")[0];
+          // Sometimes, the quarantined message is actually in "error".  This
+          // happens when the bot code has thrown an exception.
+          if (msg === "unknown" || msg === "true" || msg === true) {
+            msg = this._attribute(bot, "error");
+          }
+          return "Quarantined: " + msg;
         }
         return "Alive";
       },
@@ -352,8 +357,13 @@
 
     Polymer({
       is: 'bot-list',
-      behaviors: [SwarmingBehaviors.BotListBehavior,
-                  SwarmingBehaviors.DynamicTableBehavior],
+
+      // The order behaviors are applied in matters - later ones overwrite
+      // attributes of earlier ones
+      behaviors: [
+          SwarmingBehaviors.BotListBehavior,
+          SwarmingBehaviors.DynamicTableBehavior,
+      ],
 
       properties: {
         client_id: {