Remove annoying rubric parsing error, redo how notifications work

common/lib/xmodule/xmodule/js/src/combinedopenended/display.coffee

@@ -201,10 +201,6 @@ class @CombinedOpenEnded
 
     @rebind()
 
-    if @task_number>1
-      @show_combined_rubric_current()
-      @show_results_current()
-
   show_results_current: () =>
     data = {'task_number' : @task_number-1}
     $.postWithPrefix "#{@ajax_url}/get_results", data, (response) =>

common/lib/xmodule/xmodule/open_ended_grading_classes/self_assessment_module.py

@@ -267,8 +267,6 @@ class SelfAssessmentModule(openendedchild.OpenEndedChild):
         try:
             rubric_scores = json.loads(latest_post_assessment)
         except:
-            # This is a dev_facing_error
-            log.error("Cannot parse rubric scores in self assessment module from {0}".format(latest_post_assessment))
             rubric_scores = []
         return [rubric_scores]