Updated subreddit exception handling for PRAW 3.
Updated subreddit exception handling for PRAW 3.

michael-lazar/rtv,5225225/rtv,shaggytwodope/rtv,Brobin/rtv,michael-lazar/rtv,yskmt/rtv,obosob/rtv,shaggytwodope/rtv,TheoPib/rtv,5225225/rtv,arnoutpierre/rtv,TheoPib/rtv,yskmt/rtv,michael-lazar/rtv,bigplus/rtv