[glib] Deal with startup notify id being NULL

[Matthias Clasen <matthiasc src gnome org>]

commit 94e5dafbc9ae823590aa3a3f3989b8f5978f1a9d
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Apr 11 15:46:38 2014 -0700

    Deal with startup notify id being NULL
    
    The app launch context may just not support startup notification,
    in which case, g_app_launch_context_get_startup_notify_id() will
    return NULL.
    
    Failure to take this into account leads to criticals like this:
    gnome-session[8489]: GLib-CRITICAL: g_variant_new_take_string: assertion 'string != NULL' failed
    gnome-session[8489]: GLib-CRITICAL: g_variant_new_variant: assertion 'value != NULL' failed
    gnome-session[8489]: GLib-CRITICAL: g_variant_get_type: assertion 'value != NULL' failed
    gnome-session[8489]: GLib-CRITICAL: g_variant_type_is_subtype_of: assertion 'g_variant_type_check (type)' 
failed
    
    https://bugzilla.gnome.org/show_bug.cgi?id=728066

 gio/gdesktopappinfo.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/gio/gdesktopappinfo.c b/gio/gdesktopappinfo.c
index 0582b52..7cf3cc0 100644
--- a/gio/gdesktopappinfo.c
+++ b/gio/gdesktopappinfo.c
@@ -2182,7 +2182,11 @@ g_desktop_app_info_launch_uris_with_spawn (GDesktopAppInfo            *info,
               sn_id = g_app_launch_context_get_startup_notify_id (launch_context,
                                                                   G_APP_INFO (info),
                                                                   launched_files);
-              envp = g_environ_setenv (envp, "DESKTOP_STARTUP_ID", sn_id, TRUE);
+              if (sn_id)
+                {
+                  envp = g_environ_setenv (envp, "DESKTOP_STARTUP_ID", sn_id, TRUE);
+                  g_free (sn_id);
+                }
             }
 
           g_list_free_full (launched_files, g_object_unref);
@@ -2289,7 +2293,8 @@ g_desktop_app_info_make_platform_data (GDesktopAppInfo   *info,
           gchar *sn_id;
 
           sn_id = g_app_launch_context_get_startup_notify_id (launch_context, G_APP_INFO (info), 
launched_files);
-          g_variant_builder_add (&builder, "{sv}", "desktop-startup-id", g_variant_new_take_string (sn_id));
+          if (sn_id)
+            g_variant_builder_add (&builder, "{sv}", "desktop-startup-id", g_variant_new_take_string 
(sn_id));
         }
 
       g_list_free_full (launched_files, g_object_unref);