emptyThread.isNew() -> false

h/static/scripts/directive/test/thread-test.coffee

@@ -61,6 +61,14 @@ describe 'thread', ->
 
       assert(not controller.isNew())
 
+    it 'returns false from isNew() for a null annotation', ->
+      createDirective()
+
+      # The ThreadController may be an empty container.
+      controller.container = {}
+
+      assert(not controller.isNew())
+
     describe '#toggleCollapsed', ->
       count = null
 

h/static/scripts/directive/thread.coffee

@@ -147,7 +147,7 @@ ThreadController = [
     # false otherwise.
     ###
     this.isNew = ->
-      return (this.id and not this.container?.message?.id)
+      return (this.container?.message? and not this.container?.message?.id)
 
     this._isFilterActive = ->
       if @filter