[gnome-control-center] info panel: return "Unknown" on OS lacking os-release

[Robert Ancell <rancell src gnome org>]

commit 331f0d119b99baf3f2d1b7ddcf97bf8b435c9ec8
Author: Antoine Jacoutot <ajacoutot gnome org>
Date:   Thu May 9 23:10:17 2019 +0200

    info panel: return "Unknown" on OS lacking os-release
    
    Return "Unknown" instead of the empty string if os_info fails.

 panels/info/cc-info-overview-panel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/panels/info/cc-info-overview-panel.c b/panels/info/cc-info-overview-panel.c
index 4541986db..0d0a17fcf 100644
--- a/panels/info/cc-info-overview-panel.c
+++ b/panels/info/cc-info-overview-panel.c
@@ -437,7 +437,7 @@ get_os_name (void)
   os_info = get_os_info ();
 
   if (!os_info)
-    return NULL;
+    g_strdup (_("Unknown"));
 
   name = g_hash_table_lookup (os_info, "NAME");
   version_id = g_hash_table_lookup (os_info, "VERSION_ID");