FIX: Ensure status change when no comment

* Fix the triggering of task status from the feeback
  dialog, even when there is no comment.
* Only post comment when there is comment text

src/app/tasks/task-feedback-assessor/task-feedback-assessor.coffee

@@ -21,12 +21,14 @@ angular.module('doubtfire.tasks.task-feedback-assessor',[])
     $scope.comment = { text: "" }
 
     $scope.triggerTransition = (status) ->
-      # Firstly, try to add a comment
-      taskService.addComment $scope.task, $scope.comment.text,
-        (success) ->
-          # If the comment was successful then reset text and trigger transition
-          $scope.comment.text = ""
-          taskService.updateTaskStatus $scope.unit, $scope.task.project(), $scope.task, status
+      if $scope.comment.text.length > 0
+        # Firstly, try to add a comment
+        taskService.addComment $scope.task, $scope.comment.text,
+          (success) ->
+            # If the comment was successful then reset text and trigger transition
+            $scope.comment.text = ""
+      # Always trigger status update
+      taskService.updateTaskStatus $scope.unit, $scope.task.project(), $scope.task, status
 
     if $scope.onStatusUpdate? && _.isFunction($scope.onStatusUpdate)
       $scope.$on 'TaskStatusUpdated', (event, args) ->