[gnome-boxes/check-for-oses-without-medias-3-30] wizard-downloads: Check for OSes without medias

[Felipe Borges <felipeborges src gnome org>]

commit 42e4d0778489bc2a55192cfa3c0f22763f7b0e42
Author: Felipe Borges <felipeborges gnome org>
Date:   Mon Nov 26 13:34:35 2018 +0100

    wizard-downloads: Check for OSes without medias
    
    This is a very corner case, but it might happen that the user
    does not have data in the osinfo-db at all, causing us to
    populate the recommended list model with a null pointer.
    
    Fixes #283

 src/wizard-downloads-page.vala | 4 ++--
 src/wizard-source.vala         | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/wizard-downloads-page.vala b/src/wizard-downloads-page.vala
index caca4e65..97e8da02 100644
--- a/src/wizard-downloads-page.vala
+++ b/src/wizard-downloads-page.vala
@@ -91,8 +91,8 @@ private async void populate_recommended_list () {
             try {
                 var os = yield os_db.get_os_by_id (os_id);
                 var media = os.get_media_list ().get_nth (0) as Osinfo.Media;
-
-                recommended_model.append (media);
+                if (media != null)
+                    recommended_model.append (media);
             } catch (OSDatabaseError error) {
                 warning ("Failed to find OS with id: '%s': %s", os_id, error.message);
             }
diff --git a/src/wizard-source.vala b/src/wizard-source.vala
index b153b355..7eef978b 100644
--- a/src/wizard-source.vala
+++ b/src/wizard-source.vala
@@ -444,8 +444,8 @@ private void populate_recommended_downloads () {
 
                     // TODO: Select the desktop/workstation variant.
                     var media = os.get_media_list ().get_nth (0) as Osinfo.Media;
-
-                    downloads_model.append (media);
+                    if (media != null)
+                        downloads_model.append (media);
                 } catch (OSDatabaseError error) {
                     warning ("Failed to find OS with ID '%s': %s", os_id, error.message);
                     return;