解决参数为空的bug

app/controllers/exercise_controller.rb

@@ -449,11 +449,11 @@ class ExerciseController < ApplicationController
       # 问答题有多个答案
       if question.question_type == 3
         if standard_answer.exercise_choice_id.include?(answer.exercise_choice_id)
-          score = score + question.question_score
+          score += question.question_score unless question.question_score.empty?
         end
       else
         if answer.exercise_choice_id == standard_answer.exercise_choice_id
-          score = score + question.question_score
+          score += question.question_score unless question.question_score.empty?
         end
       end
     end

app/helpers/exercise_helper.rb

@@ -65,7 +65,9 @@ module ExerciseHelper
     score = 0
     unless exercise.nil?
       exercise.exercise_questions.each do |exercise_question|
-        score += exercise_question.question_score
+        unless exercise_question.question_score.nil?
+          score += exercise_question.question_score
+        end
       end
       return score
     end