i3pystatus: fix Exception on empty arrival time

.config/i3pystatus/ice-status.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-from datetime import datetime
+from datetime import datetime, timedelta
 from requests import get
 from subprocess import check_output
 from sys import exit
@@ -52,8 +52,12 @@ try:
             else:
                 delay = ''
 
+            if stop['timetable'].get('actualArrivalTime', 0):
                 arrival = datetime.fromtimestamp(stop['timetable']['actualArrivalTime']/1000)
                 arrival_in = arrival - now
+            else:
+                arrival = datetime.now()
+                arrival_in = timedelta()
 
             next_stop = '{} <span color="#999999">[{}]</span> {} ({}{})'.format(
                 stop['station']['name'],