Fix a crash for when trying to post-process episodes that are detected as air...

Fix a crash for when trying to post-process episodes that are detected as air by date but the date is invalid

sickbeard/postProcessor.py

@@ -462,6 +462,10 @@ class PostProcessor(object):
                     self._log(u"Got season "+str(season)+" episodes "+str(episodes), logger.DEBUG)
                 except tvdb_exceptions.tvdb_episodenotfound, e:
                     self._log(u"Unable to find episode with date "+str(episodes[0])+u" for show "+str(tvdb_id)+u", skipping", logger.DEBUG)
+
+                    # we don't want to leave dates in the episode list if we couldn't convert them to real episode numbers
+                    episodes = []
+
                     continue
 
             # if there's no season then we can hopefully just use 1 automatically