fix bug

app/views/exercises/_shixun_details.json.jbuilder

@@ -27,16 +27,12 @@ json.shixun_detail do
       json.output_detail output_detail game, output
     end
 
-    if game.evaluate_count > 0
     if game.try(:lastest_code).blank?
       cha_path = challenge_path(shixun_challenge.challenge&.path)
       latest_code = git_fle_content(shixun_challenge.shixun&.repo_path,cha_path)
     else
       latest_code = game.try(:lastest_code)
     end
-    else
-      latest_code = nil
-    end
 
     json.passed_code latest_code
   end