crm_update_contact() causes PHP error if no phone object to exist for the contact

If the contact is not created with a phone field, it cannot be updated.

crm_update_contact() tries to update a non-existant phone record, leading to a PHP error.

I think is issue is in utils::_crm_update_contact() - there should be checks that $contact->location[$contactLocationBlock]->X is an object when calling _crm_update_object()

I'd guess similar problems will happen if the contact has no associated im, email or postal_code/address object - not confirmed though