Fix tests

Tools/GardeningServer/ui/ct-unexpected-failures.html

Index: Tools/GardeningServer/ui/ct-unexpected-failures.html
diff --git a/Tools/GardeningServer/ui/ct-unexpected-failures.html b/Tools/GardeningServer/ui/ct-unexpected-failures.html
index 154cffe7865929834456ce208b68d69c6e48452f..c9c54a2171c45fab296a5a53616801e0fa3db578 100644
--- a/Tools/GardeningServer/ui/ct-unexpected-failures.html
+++ b/Tools/GardeningServer/ui/ct-unexpected-failures.html
@@ -42,7 +42,7 @@ found in the LICENSE file.
     <template if="{{ failures && failures.failures && (!failures.failures[tree] || !failures.failures[tree].length) }}">
       <ct-party-time></ct-party-time>
     </template>
-    <ct-failure-stream title="Probably-hung bots" category="builders" groups="{{ failures.failures[tree] }}" commitLog="{{ commitLog }}" tree="{{ tree }}"></ct-failure-stream>
+    <ct-failure-stream title="Probably-hung bots" category="builders" groups="{{ failures && failures.failures[tree] }}" commitLog="{{ commitLog }}" tree="{{ tree }}"></ct-failure-stream>
     <ct-failure-stream title="Reliable failures" category="default" groups="{{ failures && failures.failures[tree] }}" commitLog="{{ commitLog }}" tree="{{ tree }}"></ct-failure-stream>
     <ct-failure-stream title="Failures that have only happened once (on one bot)" category="failedOnce" groups="{{ failures && failures.failures[tree] }}" commitLog="{{ commitLog }}" tree="{{ tree }}"></ct-failure-stream>
     <ct-failure-stream title="Snoozed failures" category="snoozed" groups="{{ failures && failures.failures[tree] }}" commitLog="{{ commitLog }}" tree="{{ tree }}"></ct-failure-stream>