still problems with py-ard 2.1.0

[mmaiers-nmdp]

$ pyard --version
IPD-IMGT/HLA version: 3640
py-ard version: 2.1.0

 pyard -g B63 -r lgx
Traceback (most recent call last):
...
  File "/.../serology_handler.py", line 62, in get_alleles_from_serology
    alleles = db.serology_to_alleles(self.ard.db_connection, serology)
  File "/...pyard/db.py", line 188, in serology_to_alleles
    alleles = result[0].split("/")
              ^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'split'

$ pyard -g B1516 -r lgx
Allele Error: B1516 is not a valid Allele

$ pyard -g A9 -r lgx
A*23:01/A*23:02/A*23:03/A*23:05/A*23:06... A*24:02/A*24:03/A*24:05/A*24:06/A*24:07/...

$ pyard -g A24 -r lgx
A*24:02/A*24:03/A*24:05/A...

Issues:

1. for B1516, this is getting mis-recognized as a v2 allele.
2. B63 returns an empty list (since there are not alleles that map to it in 3.64.0). This breaks line 188 in db.py because it is trying to split an empty string

[pbashyal-nmdp]

Oh no. B63!! I'll take a look.

[pbashyal-nmdp]

B1516 is not valid because we had a hard-coded mapping of recognized serology.

https://github.com/nmdp-bioinformatics/py-ard/blob/master/pyard/serology.py#L106

We were not expecting new Serology to be defined.