UnboundLocalError: local variable 'downloader' referenced before assignment

(Okay, pasting traceback in UserEcho seems a bad idea.)

Sublime Package Control crashes at Package Control.py, Line 999.

Looking at the source code, it looks like there is a chance when `downloader` hasn't been introduced to the local namespace.  This makes my plugins managed by Package Control completely unusable.  

I've currently padded 

downloader = None

just before the if statement to get the error message to properly print.