[gnome-boxes] wizard: Do create VM for non-unattended installers

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit c54ae478aa2b9e6dd66434ce1d83cd6dddf1d827
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Wed Jul 4 21:10:25 2012 +0300

    wizard: Do create VM for non-unattended installers
    
    This fixes another critical regression from commit 13bca42.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=678894

 src/wizard.vala |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/wizard.vala b/src/wizard.vala
index 9dfa236..0a7060d 100644
--- a/src/wizard.vala
+++ b/src/wizard.vala
@@ -310,9 +310,10 @@ private class Boxes.Wizard: Boxes.UI {
         nokvm_label.hide ();
         summary.clear ();
 
-        if (vm_creator != null && vm_creator.install_media is UnattendedInstaller) {
+        if (vm_creator != null) {
             try {
-                (vm_creator.install_media as UnattendedInstaller).check_needed_info ();
+                if (vm_creator.install_media is UnattendedInstaller)
+                    (vm_creator.install_media as UnattendedInstaller).check_needed_info ();
                 machine = yield vm_creator.create_vm (null);
             } catch (IOError.CANCELLED cancel_error) { // We did this, so ignore!
                 return false;