fix bug

app/controllers/homework_commons_controller.rb

@@ -200,10 +200,15 @@ class HomeworkCommonsController < ApplicationController
           if @user_course_identity >= Course::STUDENT
             tip_exception(403, "无权限操作")
           else
-            student_work_to_xlsx(@work_excel,@homework)
-            exercise_export_name = current_user.real_name + "_" + @course.name + "_" + @homework.name + "_" + Time.now.strftime('%Y%m%d_%H%M%S')
-            render xlsx: "#{exercise_export_name.strip.first(30)}",template: "homework_commons/works_list.xlsx.axlsx",locals:
-                {table_columns: @work_head_cells,task_users: @work_cells_column}
+            if @work_excel.size > 0
+              student_work_to_xlsx(@work_excel,@homework)
+              exercise_export_name = current_user.real_name + "_" + @course.name + "_" + @homework.name + "_" + Time.now.strftime('%Y%m%d_%H%M%S')
+              render xlsx: "#{exercise_export_name.strip.first(30)}",template: "homework_commons/works_list.xlsx.axlsx",locals:
+                  {table_columns: @work_head_cells,task_users: @work_cells_column}
+            else
+              normal_status(-1,"暂无提交的学生！")
+            end
+
           end
         }
         format.zip{

app/templates/exercise_export/blank_exercise.html.erb

@@ -18,7 +18,7 @@
       </div>
     </div>
     <div class="mbt20 bgc">
-      <div class="ex-scores pd10 text-gray fs13">
+      <div class="ex-scores pd10 text-gray fs13 width100">
         <div class="inline-block pull-left max-100">
           <% if @exercise_single_ques_count > 0 %>
         <span class="mr15">单选题<span class="mlr5"><%= @exercise_single_ques_count %></span>题,

app/templates/exercise_export/exercise_export.css

@@ -306,6 +306,10 @@ textarea{
 .max-100{
     max-width:100%;
 }
+.width100{
+    width:100%;
+    word-break:normal;
+}