[gnome-software] shell extensions: Downgrade a warning to debug if we can't match UUID

[Kalev Lember <klember src gnome org>]

commit ae2be9d6c913e528a07e5256dab72ab303fad700
Author: Kalev Lember <klember redhat com>
Date:   Sun Sep 23 07:36:32 2018 +0200

    shell extensions: Downgrade a warning to debug if we can't match UUID
    
    This can legitimately happen when we get ExtensionStatusChanged for a
    system-installed package.

 plugins/shell-extensions/gs-plugin-shell-extensions.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/plugins/shell-extensions/gs-plugin-shell-extensions.c 
b/plugins/shell-extensions/gs-plugin-shell-extensions.c
index 269202eb..28259adb 100644
--- a/plugins/shell-extensions/gs-plugin-shell-extensions.c
+++ b/plugins/shell-extensions/gs-plugin-shell-extensions.c
@@ -251,7 +251,7 @@ gs_plugin_shell_extensions_changed_cb (GDBusProxy *proxy,
                /* find it in the cache; do we care? */
                app = gs_plugin_cache_lookup (plugin, uuid);
                if (app == NULL) {
-                       g_warning ("no app for changed %s", uuid);
+                       g_debug ("no app for changed %s", uuid);
                        return;
                }