[gnome-software/gnome-3-20] trivial: Show a warning when an application vanishes from xdg-app metadata

[Richard Hughes <rhughes src gnome org>]

commit a859dc9785a038207e90f7385708e12751e55d68
Author: Richard Hughes <richard hughsie com>
Date:   Thu Apr 14 11:28:31 2016 +0100

    trivial: Show a warning when an application vanishes from xdg-app metadata

 src/plugins/gs-plugin-xdg-app.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/plugins/gs-plugin-xdg-app.c b/src/plugins/gs-plugin-xdg-app.c
index 2c7239d..713eb13 100644
--- a/src/plugins/gs-plugin-xdg-app.c
+++ b/src/plugins/gs-plugin-xdg-app.c
@@ -823,8 +823,10 @@ gs_plugin_refine_item_metadata (GsPlugin *plugin,
 
        /* AppStream sets the source to appname/arch/branch, if this isn't set
         * we can't break out the fields */
-       if (gs_app_get_source_default (app) == NULL)
+       if (gs_app_get_source_default (app) == NULL) {
+               g_warning ("no source set by appstream for %s", plugin->name);
                return TRUE;
+       }
 
        /* parse the ref */
        xref = xdg_app_ref_parse (gs_app_get_source_default (app), error);