[grilo-plugins] lua-factory: Don't warn for empty values

[Bastien Nocera <hadess src gnome org>]

commit a5f53a2d5d466542d9754fdef6beb56027451de9
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Feb 26 14:36:07 2014 +0100

    lua-factory: Don't warn for empty values
    
    Sometimes, values will be set to nil for certain keys, which should
    simply be ignored. Don't print warnings or debug in those cases.

 src/lua-factory/grl-lua-library.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/lua-factory/grl-lua-library.c b/src/lua-factory/grl-lua-library.c
index e551476..158bc08 100644
--- a/src/lua-factory/grl-lua-library.c
+++ b/src/lua-factory/grl-lua-library.c
@@ -140,7 +140,7 @@ grl_util_build_media (lua_State *L,
           grl_data_set_int (GRL_DATA (media), key_id, lua_tointeger (L, -1));
         } else if (lua_istable (L, -1)) {
           grl_util_add_table_to_media (L, media, key_id, key_name, type);
-        } else {
+        } else if (!lua_isnil (L, -1)) {
           GRL_WARNING ("'%s' is not compatible for '%s'",
                        lua_typename (L, -1), key_name);
         }
@@ -151,7 +151,7 @@ grl_util_build_media (lua_State *L,
           grl_data_set_float (GRL_DATA (media), key_id, lua_tonumber (L, -1));
         } else if (lua_istable (L, -1)) {
           grl_util_add_table_to_media (L, media, key_id, key_name, type);
-        } else {
+        } else if (!lua_isnil (L, -1)) {
           GRL_WARNING ("'%s' is not compatible for '%s'",
                        lua_typename (L, -1), key_name);
         }
@@ -162,7 +162,7 @@ grl_util_build_media (lua_State *L,
           grl_data_set_string (GRL_DATA (media), key_id, lua_tostring (L, -1));
         } else if (lua_istable (L, -1)) {
           grl_util_add_table_to_media (L, media, key_id, key_name, type);
-        } else {
+        } else if (!lua_isnil (L, -1)) {
           GRL_WARNING ("'%s' is not compatible for '%s'",
                        lua_typename (L, -1), key_name);
         }
@@ -179,7 +179,7 @@ grl_util_build_media (lua_State *L,
            gsize size = luaL_len (L, -1);
            const guint8 *binary = lua_tostring (L, -1);
            grl_data_set_binary (GRL_DATA (media), key_id, binary, size);
-        } else {
+        } else if (!lua_isnil (L, -1)) {
           GRL_DEBUG ("'%s' is being ignored as G_TYPE is not being handled.",
                      key_name);
         }