Merge pull request #186 from overleaf/jpa-fix-join-project-error-context

[misc] fix join project error context

services/real-time/app/js/Router.js

@@ -29,7 +29,7 @@ module.exports = Router = {
   _handleError(callback, error, client, method, attrs) {
     attrs = attrs || {}
     for (const key of ['project_id', 'user_id']) {
-      attrs[key] = client.ol_context[key]
+      attrs[key] = attrs[key] || client.ol_context[key]
     }
     attrs.client_id = client.id
     attrs.err = error