Vips modification feedback, re #203

controllers/sheets.php

@@ -1393,7 +1393,6 @@ class SheetsController extends StudipController
             }
         }
 
-
         usort($selftest_feedback_options, function($a, $b) {
             if ($a['threshold'] == $b['threshold']) {
                 return 0;
@@ -1402,10 +1401,8 @@ class SheetsController extends StudipController
                 return -1;
             }
             return 1;
-
         });
 
-
         $assignment->options['feedback'] = $selftest_feedback_options;
 
         $start_datetime = DateTime::createFromFormat('d.m.Y H:i', $start_date.' '.$start_time);