[evolution] I#484 - Add also i_cal_time_is_null_time() into memo_table_date_edit_before_popup_cb()

[Milan Crha <mcrha src gnome org>]

commit d744b30df4af077488a0639d7a665bd407fa4bd2
Author: Milan Crha <mcrha redhat com>
Date:   Thu Jun 13 17:34:56 2019 +0200

    I#484 - Add also i_cal_time_is_null_time() into memo_table_date_edit_before_popup_cb()
    
    Related to https://gitlab.gnome.org/GNOME/evolution/issues/484

 src/calendar/gui/e-memo-table.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/calendar/gui/e-memo-table.c b/src/calendar/gui/e-memo-table.c
index 9f97243e11..1f32d715dd 100644
--- a/src/calendar/gui/e-memo-table.c
+++ b/src/calendar/gui/e-memo-table.c
@@ -179,7 +179,7 @@ memo_table_date_edit_before_popup_cb (ECellDateEdit *cell_date_edit,
                                ICalTime *dtstart;
 
                                dtstart = i_cal_property_get_dtstart (prop);
-                               date_only = !dtstart || i_cal_time_is_date (dtstart);
+                               date_only = !dtstart || i_cal_time_is_null_time (dtstart) || 
i_cal_time_is_date (dtstart);
                                g_clear_object (&dtstart);
                        }