%naa% displays nothing

[theuving]

Hello,
adjusting the playing screen, I noticed yesterday that %naa% displays nothing. Other Tags like %nt% and so on work flawlessly, but %naa% doesn't work.
I use the newest gonemad version and tested this on my Huawei Ascend Y201 pro Smartphone and on my archos 101 g9 tablet.

[GoneMAD]

most likely because the file has an empty artist album tag. The code doesnt use the artist tag if the album artist is empty. I'll have to change that

It works fine if the albumartist tag is populated (gmmp will fill in an empty album artist with the artist in the database but doestn touch the tag unless using the tag editor)