[patch] allow empty ID3v2 frames

[Peter van Hardenberg]

Some media software out there is creating ID3v2 tags with a 0-length data field. This patch keeps TagLib from failing to parse those tags by allowing a 0-length data field. The ID3v2.4 spec I consulted specifically states that the length should be non-zero, but obviously improving support for data in the wild is desirable.

This passed all our tests and is working fine in Songbird, but I'm posting it here for wider consideration.

-pvh
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