Remove deprecated call to watchdog_exception()

Pushed 2c5f9721 along with 5d9c6851 which makes the module incompatible with drupal 9 since Error::logException() was only introduced in drupal 10 https://www.drupal.org/node/2932520 →

Made new RC https://www.drupal.org/project/search_api_fusion/releases/2.0.0-rc1 →

Automatically closed - issue fixed for 2 weeks with no activity.