can't delete first part

One of our faculty just ran into the problem that you can't delete the first part of an assessment. Clearly we don't want an assessmment with zero parts, but if you have multiple parts, there's no reason not to delete the first. You can emulate this by moving the content of the second to the first, etc, but if you have several parts (e.g. because you are drawing from several pools) this gets tedious very quickly.