Runtime Error using refseqs

The fasta file used is here: https://gist.github.com/eclarke/87035467b438b5f9e7b5

```
INFO:root:Evaluating alignment results
Traceback (most recent call last):
[...]
  File "/Users/ecl/data/analyses/16S/unassigner/unassign/algorithm.py", line 110, in unassign
    "Missing reference hits for %s" % species_id)
RuntimeError: Missing reference hits for X82823
```
