[recipes] Avoid a (null) showing up in the about dialog

[Matthias Clasen <matthiasc src gnome org>]

commit 9adcf9dc7944f332cd9e3940a8a2b7534d4f89f0
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Feb 20 22:15:23 2017 -0500

    Avoid a (null) showing up in the about dialog
    
    Currently, we can't find out the OS name when running
    in a sandbox (I've filed a ticket to have that fixed).
    But we still shouldn't show (null).

 src/gr-about-dialog.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/gr-about-dialog.c b/src/gr-about-dialog.c
index 37ca146..fcaaf4a 100644
--- a/src/gr-about-dialog.c
+++ b/src/gr-about-dialog.c
@@ -215,6 +215,13 @@ get_os_information (char **os_name,
                 if (platform && minor && micro)
                         *version = g_strconcat (platform, ".", minor, ".", micro, NULL);
         }
+
+        if (!*os_name)
+                *os_name = g_strdup (_("Unknown"));
+        if (!*os_type)
+                *os_type = g_strdup (_("Unknown"));
+        if (!*desktop)
+                *desktop = g_strdup (_("Unknown"));
 }
 
 static void