Devel generate assigns vocabularies to content types that don't exist

To reproduce:

1. Install HEAD with the "minimal" install profile, which comes with no content types by default.
2. Generate some taxonomy terms.
3. Go to Administer >> Content management >> Taxonomy, and you'll see vocabularies assigned to types such as story and forum (eh? forum??)

I would've expected:

1. To get an error at the generate taxonomy page that there are no valid content types to assign vocabularies to, and not allow me to proceed.
2. For the vocabulary generation to only assign to types that actually exist in the system.