[libmediaart] extract: Allow empty artist in media_art_set

[Jens Georg <jensgeorg src gnome org>]

commit 8281496f5b23d5ea5d4756f3eb76b5a14af7e9be
Author: Jens Georg <mail jensge org>
Date:   Tue Nov 11 09:08:46 2014 +0100

    extract: Allow empty artist in media_art_set
    
    https://bugzilla.gnome.org/show_bug.cgi?id=739942

 libmediaart/extract.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/libmediaart/extract.c b/libmediaart/extract.c
index 7647957..a5d4ad2 100644
--- a/libmediaart/extract.c
+++ b/libmediaart/extract.c
@@ -1032,7 +1032,6 @@ media_art_set (const unsigned char  *buffer,
        gboolean retval = FALSE;
 
        g_return_val_if_fail (type > MEDIA_ART_NONE && type < MEDIA_ART_TYPE_COUNT, FALSE);
-       g_return_val_if_fail (artist != NULL, FALSE);
        g_return_val_if_fail (title != NULL, FALSE);
 
        /* What we do here: