event-widget: fix events with no end date

src/gcal-event-widget.c

@@ -912,7 +912,7 @@ gcal_event_widget_peek_end_date (GcalEventWidget *event)
   GcalEventWidgetPrivate *priv;
   priv = gcal_event_widget_get_instance_private (event);
 
-  return priv->dt_end;
+  return priv->dt_end != NULL ? priv->dt_end : priv->dt_start;
 }
 
 void

src/gcal-utils.c

@@ -397,6 +397,9 @@ gint
 icaltime_compare_date (const icaltimetype *date1,
                        const icaltimetype *date2)
 {
+  if (date2 == NULL)
+    return 0;
+
   if (date1->year < date2->year)
     return -1;
   else if (date1->year > date2->year)

src/gcal-year-view.c

@@ -1158,7 +1158,10 @@ gcal_year_view_component_added (ECalDataModelSubscriber *subscriber,
   e_cal_component_free_datetime (&date);
 
   e_cal_component_get_dtend (comp, &date);
-  event_end = icaltime_as_timet_with_zone (*(date.value), date.value->zone != NULL ? date.value->zone : zone);
+  if (date.value != NULL)
+    event_end = icaltime_as_timet_with_zone (*(date.value), date.value->zone != NULL ? date.value->zone : zone);
+  else
+    event_end = event_start;
   e_cal_component_free_datetime (&date);
 
   if (!((event_start <= range_start && event_end >= range_end) ||