do not tb if with contact we have no logs at all

src/history_window.py

@@ -120,11 +120,12 @@ class HistoryWindow:
 		# select and show logs for last date we have logs with contact
 		# and if we don't have logs at all, default to today
 		result = gajim.logger.get_last_date_that_has_logs(self.jid)
-		tim = result[0]
-		if tim != '':
-			date = time.localtime(tim)
-		else:
+		if result is None:
 			date = time.localtime()
+		else:
+			tim = result[0]
+			date = time.localtime(tim)
+
 		y, m, d = date[0], date[1], date[2]
 		self.calendar.select_day(d)
 		self.add_lines_for_date(y, m, d)