Uberon OWL parse error

[diekhans]

Parsing
http://ontologies.berkeleybop.org/uberon/ext.owl

results in the error:

  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pronto/utils/meta.py", line 80, in newfunc
    raise TypeError(msg.format(name))
TypeError: 'description' must be str, not NoneType

[althonos]

Fixed in 33c372e.