[gnome-boxes] Revert "Asynchronously load VM sources"

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 62e0e7bb049606a04c2bdf6a0b3da50dcd617cea
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Mon Sep 2 17:57:52 2013 +0300

    Revert "Asynchronously load VM sources"
    
    This patch broke launching of VMs from commandline and therefore
    from gnome-shell search results as well. Reverting it for now but lets
    re-implement it in a more robust way later.
    
    This reverts commit 14484a31f775d73412cd49dd42e8baae5e75366f.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=706742

 src/app.vala |   15 ++++++---------
 1 files changed, 6 insertions(+), 9 deletions(-)
---
diff --git a/src/app.vala b/src/app.vala
index e9c9be5..225c79e 100644
--- a/src/app.vala
+++ b/src/app.vala
@@ -432,16 +432,13 @@ private class Boxes.App: Boxes.UI {
             return false;
         });
 
-        var i = 0;
         foreach (var source in new_sources)
-            add_collection_source.begin (source, (obj, res) => {
-                    add_collection_source.end (res);
-                    i++;
-                    if ((i == new_sources.length ()) && (default_connection == null)) {
-                        printerr ("Missing or failing default libvirt connection\n");
-                        application.release (); // will end application
-                    }
-            });
+            yield add_collection_source (source);
+
+        if (default_connection == null) {
+            printerr ("Missing or failing default libvirt connection\n");
+            application.release (); // will end application
+        }
     }
 
     private void save_window_geometry () {