During creation of a location, if it is assigned organizations which are invalid the creation fails as the location attempts to validate the associated organization. (This also happens the other way around). This is due to has_and_belongs_to_many defaulting to validating the associated records as well.

Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1514915

Description of problem:

1. curl -sku admin:changeme -d '{"location": {"name": "foo6", "organization_ids": [1]}}' -H 'Content-Type: application/json' https://$(hostname)/api/v2/locations {
   "error": {"id":null,"errors":{"organizations":["is invalid"]},"full_messages":["Organizations is invalid"]}
   }

- specifying other (existing) organization id(s) works as expected

Actual results:
Organizations is invalid

Expected results:
Location created and assigned to Default Organization