[BioRuby] Bio::SPTR bug and fix

[Ben Woodcroft]

Hi,

So I was trying to parse a uniprot file, and I found that bioruby threw an
error when asked it to return a DR key that didn't exist in the uniprot file
(in particular, GO annotations when none were defined).

I made a branch that fixes this by returning [] in that situation, and added
a test for it as well:
http://github.com/wwood/bioruby/tree/sptr_fix

If this code is good enough then can I request it be merged into the tree?

Thanks,
ben

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