* When removing a buddy, the group is optional as noted in the description.
* When setting a buddy icon, the icon may be %NULL to remove existing icons.
Testing Done:
Compile and watch for assertion failures in the log, when signing out of Bonjour, and when removing a buddy icon from an account (which did nothing.)
Reviewed at https://reviews.imfreedom.org/r/445/
PidginandFinch:ThePimpin' Penguin IM Clients That'reGoodfortheSoul
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