[grilo-plugins] lua-factory: not warn for unknown keys in source table

[Victor Toso de Carvalho <victortoso src gnome org>]

commit fa5539b92f4df721f24edff0da3c8bed17892fcc
Author: Victor Toso <me victortoso com>
Date:   Wed Mar 2 22:21:23 2016 +0100

    lua-factory: not warn for unknown keys in source table
    
    At load time, lua-sources may rely on metadata-keys created in another
    plugin. The warning would cause any test on lua sources to fail unless
    it loads all necessary plugins for its metadata-keys.
    
    e.g.
    (test_local_metadata:9549): Grilo-WARNING **: [lua-factory]
    grl-lua-factory.c:895: Unknown key 'acoustid-fingerprint' in property
    'required' for source 'grl-acoustid'
    
    https://bugzilla.gnome.org/show_bug.cgi?id=732879

 src/lua-factory/grl-lua-factory.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/lua-factory/grl-lua-factory.c b/src/lua-factory/grl-lua-factory.c
index 888ce33..426eb3b 100644
--- a/src/lua-factory/grl-lua-factory.c
+++ b/src/lua-factory/grl-lua-factory.c
@@ -892,7 +892,8 @@ keys_table_array_to_list (lua_State *L,
     if (key_id != GRL_METADATA_KEY_INVALID) {
       filtered_list = g_list_prepend (filtered_list, GRLKEYID_TO_POINTER (key_id));
     } else {
-      GRL_WARNING ("Unknown key '%s' in property '%s' for source '%s'", key_name, array_name, source_id);
+      GRL_DEBUG ("Unknown key '%s' in property '%s' for source '%s'",
+                 key_name, array_name, source_id);
     }
   }
   g_list_free_full (list, g_free);