some more code cleanup and UI optimizations

app/assets/javascripts/editor/submissions.js.erb

@@ -156,6 +156,7 @@ CodeOceanEditorSubmissions = {
     if ($('#test').is(':visible')) {
       this.createSubmission('#test', null, function(response) {
         this.showSpinner($('#test'));
+        $('#score_div').addClass('hidden');
         var url = response.test_url.replace(this.FILENAME_URL_PLACEHOLDER, this.active_file.filename);
         this.initializeSocketForTesting(url);
       }.bind(this));