Rename attribute and restructure conditions

app/controllers/concerns/submission_scoring.rb

@@ -9,7 +9,7 @@ module SubmissionScoring
         assessment = assessor.assess(output)
         passed = ((assessment[:passed] == assessment[:count]) and (assessment[:score] > 0))
         testrun_output = passed ? nil : 'message: ' + output[:message].to_s + "\n stdout: " + output[:stdout].to_s + "\n stderr: " + output[:stderr].to_s
-        if !testrun_output.blank?
+        unless testrun_output.blank?
           submission.exercise.execution_environment.error_templates.each do |template|
             pattern = Regexp.new(template.signature).freeze
             if pattern.match(testrun_output)