fix taxa2lca, closes #275
fix taxa2lca, closes #275

bmesuere/uni-test,unipept/unipept,bmesuere/uni-test,bmesuere/uni-test,bmesuere/uni-test,unipept/unipept,unipept/unipept,bmesuere/uni-test,unipept/unipept,unipept/unipept