fixed issue编辑错误

app/controllers/issues_controller.rb

@@ -191,6 +191,10 @@ class IssuesController < ApplicationController
       end 
     end
 
+    issue_files = params[:attachment_ids]
+    change_files = false
+    issue_file_ids = []
+
     if issue_files.present?
       change_files = true
       issue_files.each do |id|