Better handling of error when deleting a Build Environment that is in use

If you attempt to delete a Build Definition (Profile) that is in use (attached to a Build Definition), an error occurs:

Error Occurred
javax.jdo.JDODataStoreException: Delete request failed: DELETE FROM PROFILES WHERE ID = ? NestedThrowables: SQL Exception: DELETE on table 'PROFILES' caused a violation of foreign key constraint 'BUILDDEFINITKW_FK2' for key (16). The statement has been rolled back.

Continuum is correct to prevent the deletion, but it should display a useful error message rather than a stack trace.