Fix silly grunt error objecting to multiple blank lines and fix warning message

that cookie file does not exist when attempting to delete it.

Author: trampgeek

classes/jobesandbox.php

@@ -233,7 +233,7 @@ public function execute($sourcecode, $language, $input, $files = null, $params =
         }
 
         // Delete the cookie file.
-        unlink($cookiefile);
+        @unlink($cookiefile);
 
         $runresult = [];
         $runresult['sandboxinfo'] = [

tests/behat/ace_scratchpad_compatibility.feature

@@ -23,7 +23,6 @@ Feature: Ace UI convert to Scratchpad UI questions with one click
       | questioncategory | qtype      | name            |
       | Test questions   | coderunner | Square function |
 
-
     When I am on the "Square function" "core_question > edit" page logged in as teacher1
     And I set the following fields to these values:
       | id_customise | 1                        |