Fix exception for when no results returned.

sickbeard/providers/tokyotoshokan.py

@@ -105,6 +105,7 @@ class TokyoToshokanProvider(generic.TorrentProvider):
             with BS4Parser(data, features=["html5lib", "permissive"]) as soup:
                 torrent_table = soup.find('table', attrs={'class': 'listing'})
                 torrent_rows = torrent_table.find_all('tr') if torrent_table else []
+                if torrent_rows: 
                     if torrent_rows[0].find('td', attrs={'class': 'centertext'}):
                         a = 1
                     else: