Messages in the stream with groupcontext get their group url token rendered wrong

If an activity in the activity stream has a group context, the token that renders the group url in the message is rendered wrong.

The token that is used is: [message:gurl]
What happens in activity_logger.tokens.inc on line 99 is

              // If it's a group.. add it in the arguments.
              if (isset($group) && $group instanceof Group) {
                if ($name === 'gtitle') {
                  $replacements[$original] = $group->label();
                }
                if ($name === 'gurl') {
                  $gurl = Url::fromRoute('entity.group.canonical', array(
                    'group' => $group->id(),
                    array()
                  ));
                  $replacements[$original] = $gurl->toString();
                }
              }

It tries to create an URL from a route but Url::fromRoute is used with an empty array, thus the Drupal URL generator thinks it should render an URL with a query. But nothing is provided. So we can get rid of the query and it will work.