Missing tags in APE is normal situation, so don't print an error.

Resolves issue 437


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@12977 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/ape.c

@@ -156,7 +156,6 @@ static void ape_parse_tag(AVFormatContext *s)
 
     get_buffer(pb, buf, 8);    /* APETAGEX */
     if (strncmp(buf, "APETAGEX", 8)) {
-        av_log(NULL, AV_LOG_ERROR, "Invalid APE Tags\n");
         return;
     }