Fix newznab error message when no "q" parameter

Search URL has rid (TVRage id of the item being queried.) but not q but still there's results beucause the rid.

From log: Search url: https://api.nzbgeek.info/api?apikey=***&season=7&maxage=300&cat=5030%2C5040&limit=100&attrs=rageid&offset=0&rid=123456&t=tvsearch

http://newznab.readthedocs.org/en/latest/misc/api/#tv-search