Deleted vocab still appearing in admin categories

Issue Summary

This bug actually shows up both in the official 6.x-1.3 release and the 6.x-1.x-dev, though I'm not sure if the first is influencing the other. Explanation:

Developing a site where certain users need permission to simply create content (writers, assigned to authenticated user) and other users need to oversee the menu/taxonomy (managers, assigned to new role manager). I got taxonomy menu working great, and then found the module taxonomy delegate, which would seem to fit my needs very well. At first I was unsure how to establish permission to the vocabulary (I kept looking under user-management >> permissions), but after some searching and reading discovered the designate form under taxonomy. I specified that my user with the manager role should administer my two vocabularies, then logged in as that user to test. No such menu item showed up in my right hand nav menu.

After more searching and reading, I saw this had been a persistent problem with other users. I tried some experimenting on my own, creating another vocabulary called "test" and assigning both authenticated users and managers to it, then only managers to my two real vocabs. Everything works great. Hmm, my brilliant mind thinks, maybe I can delete my test vocab and fool the drupal into thinking it should still work. As usual, I did as brilliant mind dictated. Also as usual, brilliant mind did not forsee other issues: now there is an area on the administer categories page that has no vocab name, but still has a blank space where the name should be and the links "list terms" and "add terms." (sreenshot attached)

My brilliant mind has attempted to do everything it can think of to wipe this space out, including disabling the module, reneabling the module, deleting the module & reinstalling it, and then doing all these things again by clearing the cache (currently turned off for dev purposes) after each step. No dice, that space shows up again. Then I deleted the 6.x-1.3 version and installed the 6.x-1.x-dev, thinking perhaps this was an old bug that had been fixed. The space still shows up. I deleted and installed dev version with cache clearing: same result.

That was a long explanation to say: When a vocabulary is deleted that still has users designated to administer it, the vocab's permission area remains on the adminster category page. As I understand, I could now either: a, abandon this module altogether; b, just tell my users to ignore that pesky extra line; or c, delete everything on my site and start from scratch. For now, since I'm still in development, this is normal priority, but as I'm not going to choose "c" and would rather not choose "b" or "a," I'd like any attention that could be paid to this bug applied. If there's further information I should/need to provide, please let me know.