[evolution] e_calendar_view_get_tooltips: Do not crash when there's no DTEND set

[Milan Crha <mcrha src gnome org>]

commit 04c269abea8fbd711888acc186387bb0cab36ef5
Author: Milan Crha <mcrha redhat com>
Date:   Tue Dec 9 15:51:59 2014 +0100

    e_calendar_view_get_tooltips: Do not crash when there's no DTEND set

 calendar/gui/e-calendar-view.c |   36 +++++++++++++++++++++---------------
 1 files changed, 21 insertions(+), 15 deletions(-)
---
diff --git a/calendar/gui/e-calendar-view.c b/calendar/gui/e-calendar-view.c
index df1b0d8..22b278f 100644
--- a/calendar/gui/e-calendar-view.c
+++ b/calendar/gui/e-calendar-view.c
@@ -1836,24 +1836,30 @@ e_calendar_view_get_tooltips (const ECalendarViewEventData *data)
        } else {
                zone = NULL;
        }
-       t_start = icaltime_as_timet_with_zone (*dtstart.value, zone);
-       t_end = icaltime_as_timet_with_zone (*dtend.value, zone);
 
-       tmp1 = get_label (dtstart.value, zone, default_zone);
-       tmp = calculate_time (t_start, t_end);
+       if (dtstart.value) {
+               t_start = icaltime_as_timet_with_zone (*dtstart.value, zone);
+               if (dtend.value)
+                       t_end = icaltime_as_timet_with_zone (*dtend.value, zone);
+               else
+                       t_end = t_start;
 
-       /* To Translators: It will display "Time: ActualStartDateAndTime (DurationOfTheMeeting)"*/
-       tmp2 = g_strdup_printf (_("Time: %s %s"), tmp1, tmp);
-       if (zone && !cal_comp_util_compare_event_timezones (newcomp, client, default_zone)) {
-               g_free (tmp);
-               g_free (tmp1);
+               tmp1 = get_label (dtstart.value, zone, default_zone);
+               tmp = calculate_time (t_start, t_end);
 
-               tmp1 = get_label (dtstart.value, zone, zone);
-               tmp = g_strconcat (tmp2, "\n\t[ ", tmp1, " ", icaltimezone_get_display_name (zone), " ]", 
NULL);
-       } else {
-               g_free (tmp);
-               tmp = tmp2;
-               tmp2 = NULL;
+               /* To Translators: It will display "Time: ActualStartDateAndTime (DurationOfTheMeeting)"*/
+               tmp2 = g_strdup_printf (_("Time: %s %s"), tmp1, tmp);
+               if (zone && !cal_comp_util_compare_event_timezones (newcomp, client, default_zone)) {
+                       g_free (tmp);
+                       g_free (tmp1);
+
+                       tmp1 = get_label (dtstart.value, zone, zone);
+                       tmp = g_strconcat (tmp2, "\n\t[ ", tmp1, " ", icaltimezone_get_display_name (zone), " 
]", NULL);
+               } else {
+                       g_free (tmp);
+                       tmp = tmp2;
+                       tmp2 = NULL;
+               }
        }
 
        e_cal_component_free_datetime (&dtstart);