Remove unneeded check for merge_request.project

app/services/merge_requests/base_service.rb

@@ -17,12 +17,10 @@ module MergeRequests
     end
 
     def execute_hooks(merge_request, action = 'open', old_rev: nil, old_associations: {})
-      if merge_request.project
       merge_data = hook_data(merge_request, action, old_rev: old_rev, old_associations: old_associations)
       merge_request.project.execute_hooks(merge_data, :merge_request_hooks)
       merge_request.project.execute_services(merge_data, :merge_request_hooks)
     end
-    end
 
     def cleanup_environments(merge_request)
       Ci::StopEnvironmentsService.new(merge_request.source_project, current_user)