Potential unallowed exception thrown in Service::preDelete()

It's pretty simple, but hard to spot: SearchApiServiceInterface::preDelete() cannot throw exceptions, but the default implementation (SearchApiAbstractService::preDelete()) uses $this->removeIndex(), which can throw exceptions, without the necessary try/catch.

When removing the index fails (e.g., because the Solr server cannot be reached – which can easily happen when you want to delete a server), this leads to an uncaught exception which will usually/probably let the whole entity deletion fail.