[patch] fix zero length ID3v2 frames

[Andrew de Quincey]

Hi, I had a couple of mp3 files that taglib just ignored the ID3 contents of. 
Turns out they have several 0 length frames in them.

The attached patch makes taglib ignore any zero length frames completely, 
while still parsing other frames correctly. I thought this would be more 
fault tolerant than just attempting to parse them as normal frames - e.g. in 
case we find a 0 length text frame, which would be quite invalid (no text 
encoding information).

The 0length frames in the files in question were:
WOAF
WOAR
WOAS
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