Merge pull request #9771 from kazubu/fix_error_destroy_without_referer

CHANGELOG

@@ -11,6 +11,7 @@ v 8.2.0 (unreleased)
   - Fix: Inability to reply to code comments in the MR view, if the MR comes from a fork
   - Use git follow flag for commits page when retrieve history for file or directory
   - Show merge request CI status on merge requests index page
+  - Fix: 500 error returned if destroy request without HTTP referer (Kazuki Shimizu)
 
 v 8.1.1
   - Fix cloning Wiki repositories via HTTP (Stan Hu)

app/controllers/projects_controller.rb

@@ -124,11 +124,7 @@ class ProjectsController < ApplicationController
     ::Projects::DestroyService.new(@project, current_user, {}).execute
     flash[:alert] = "Project '#{@project.name}' was deleted."
 
-    if request.referer.include?('/admin')
-      redirect_to admin_namespaces_projects_path
-    else
-      redirect_to dashboard_projects_path
-    end
+    redirect_back_or_default(default: dashboard_projects_path, options: {})
   rescue Projects::DestroyService::DestroyError => ex
     redirect_to edit_project_path(@project), alert: ex.message
   end