[libsoup] soup-connection: fix SoupProxyResolverDefault breakage

[Dan Winship <danw src gnome org>]

commit b376dd82ad9beba54e85911a39f41ba8cea08498
Author: Dan Winship <danw gnome org>
Date:   Wed Apr 3 11:27:59 2013 -0400

    soup-connection: fix SoupProxyResolverDefault breakage
    
    It got broken at the last minute when adding
    SoupSession:proxy-resolver support.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=697028

 libsoup/soup-connection.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/libsoup/soup-connection.c b/libsoup/soup-connection.c
index bcc5af4..fbddfea 100644
--- a/libsoup/soup-connection.c
+++ b/libsoup/soup-connection.c
@@ -133,7 +133,8 @@ soup_connection_set_property (GObject *object, guint prop_id,
                        priv->soup_proxy_resolver = g_object_ref (proxy_resolver);
                break;
        case PROP_G_PROXY_RESOLVER:
-               priv->g_proxy_resolver = g_value_dup_object (value);
+               if (g_value_get_object (value))
+                       priv->g_proxy_resolver = g_value_dup_object (value);
                break;
        case PROP_SSL:
                priv->ssl = g_value_get_boolean (value);