[gnome-calendar] edit-calendar-page: Silence warning

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 10e10f66053a250b73fef106f5f0aebbef7b8e08
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon Jun 24 20:05:02 2019 -0300

    edit-calendar-page: Silence warning

 src/gui/calendar-management/gcal-edit-calendar-page.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/gui/calendar-management/gcal-edit-calendar-page.c 
b/src/gui/calendar-management/gcal-edit-calendar-page.c
index adedbeac..9dc71e95 100644
--- a/src/gui/calendar-management/gcal-edit-calendar-page.c
+++ b/src/gui/calendar-management/gcal-edit-calendar-page.c
@@ -299,7 +299,7 @@ gcal_edit_calendar_page_get_title (GcalCalendarManagementPage *page)
 {
   GcalEditCalendarPage *self = GCAL_EDIT_CALENDAR_PAGE (page);
 
-  return gcal_calendar_get_name (self->calendar);
+  return self->calendar ? gcal_calendar_get_name (self->calendar) : "";
 }
 
 static void