fix so we log muc messages [was broken only in svn]

src/common/connection.py

@@ -2190,7 +2190,7 @@ class Connection:
 		#last date/time in history to avoid duplicate
 		jid='%s@%s' % (room, server)
 		last_log = gajim.logger.get_last_date_that_has_logs(jid)
-		if not last_log:
+		if last_log is None:
 			last_log = 0
 		self.last_history_line[jid]= last_log
 

src/common/logger.py

@@ -402,5 +402,5 @@ class Logger:
 			AND kind NOT IN (?, ?)
 			ORDER BY time DESC LIMIT 1
 			''', (jid_id, constants.KIND_STATUS, constants.KIND_GCSTATUS))
-		result = self.cur.fetchone()
+		result = self.cur.fetchone()[0]
 		return result

src/history_window.py

@@ -125,7 +125,7 @@ class HistoryWindow:
 		if result is None:
 			date = time.localtime()
 		else:
-			tim = result[0]
+			tim = result
 			date = time.localtime(tim)
 
 		y, m, d = date[0], date[1], date[2]