Fixed IndexError: list index out of range issue

lib/subliminal/services/tvsubtitles.py

@@ -61,6 +61,8 @@ class TvSubtitles(ServiceBase):
             sid = int(match('tvshow-([0-9]+)\.html', elem.a['href']))
             show_name = match('(.*) \(', elem.a.text)
             results.append((show_name, sid))
+
+        if len(results):
             #TODO: pick up the best one in a smart way
             result = results[0]
             return result[1]