Exception 'taxonomist' unknown key

edit

In 0.6.17, I have a user with the "taxonomist" badge. Just migrated to 0.6.49 (or thereabout). When displaying the user, I get a KeyError exception (u'taxonomist' exception). The bottom of the stack has:

/ala-windanswer1/qa/wrqa_dev/askbot/models/repute.py in description
        return badges.get_badge(self.slug).description ...
▼ Local vars
Variable    Value
badges  <module 'askbot.models.badges' from '/ala-windanswer1/qa/wrqa_dev/askbot/models/badges.pyc'>
self   Error in formatting: u'taxonomist'  
/ala-windanswer1/qa/wrqa_dev/askbot/models/badges.py in get_badge
    return BADGES [key]() ...
▼ Local vars
Variable    Value
key u'taxonomist'
name    u'taxonomist'

Turns out there are a number of badges that have disapeared: Alpha, Beta, Expert, Stunk & White, Taxonomist, Yearling.

Looks like we need code to deal with badges that have been dropped so we don't get an exception.