fix bug

app/controllers/exercises_controller.rb

@@ -1291,13 +1291,15 @@ class ExercisesController < ApplicationController
           @page  = params[:page]  || 1
           @limit = params[:limit] || 20
           @exercise_users_list = @exercise_users_list.page(@page).per(@limit)
+          logger.info("#######___________@exercise_users_size_________##################{@exercise_users_size}")
+          logger.info("#######__________@export_ex_users&.exercise_user_committed.size_________##################{@export_ex_users&.exercise_user_committed.size}")
           respond_to do |format|
             format.json
             format.xlsx{
               if @user_course_identity > Course::ASSISTANT_PROFESSOR
                 tip_exception(403,"无权限操作")
               else
-                if (@exercise_users_size == 0) ||( @export_ex_users&.exercise_user_committed.size == 0)
+                if (@exercise_users_size == 0) || ( @export_ex_users&.exercise_user_committed.size == 0)
                   normal_status(-1,"暂无用户提交")
                 else
                   get_export_users(@exercise,@course,@export_ex_users)
@@ -1316,9 +1318,6 @@ class ExercisesController < ApplicationController
             format.xlsx{
               normal_status(-1,"暂无用户提交")
             }
-            format.zip{
-              normal_status(-1,"暂无用户提交")
-            }
           end
         end