[gnome-boxes] Don't choke on unknown media, use default values

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 753ac40d697399f742e39a32f16cdd6d09fda281
Author: Marc-Andrà Lureau <marcandre lureau gmail com>
Date:   Thu Feb 2 13:00:37 2012 +0100

    Don't choke on unknown media, use default values
    
    https://bugzilla.gnome.org/show_bug.cgi?id=669409

 src/wizard.vala |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/wizard.vala b/src/wizard.vala
index bcf9663..798dab5 100644
--- a/src/wizard.vala
+++ b/src/wizard.vala
@@ -207,7 +207,10 @@ private class Boxes.Wizard: Boxes.UI {
 
         try {
             install_media = InstallerMedia.instantiate.end (result);
-            resources = os_db.get_resources_for_os (install_media.os, install_media.os_media.architecture);
+            // FIXME: these values could be made editable somehow
+            var architecture = (install_media.os_media != null) ? install_media.os_media.architecture : "i686";
+
+            resources = os_db.get_resources_for_os (install_media.os, architecture);
             prep_progress.fraction = 1.0;
             page = page + 1;
         } catch (IOError.CANCELLED cancel_error) { // We did this, so no warning!