Handle blocklists without a type set

[colintheshots]

No description provided.

[groovecoder]

flake8 didn't like this ...

./bin/flake8 shavar
shavar/sources.py:35:9: F901 'raise NotImplemented' should be 'raise NotImplementedError'
shavar/sources.py:112:17: W504 line break after binary operator
shavar/sources.py:183:17: W504 line break after binary operator
shavar/parse.py:111:13: W504 line break after binary operator
shavar/views/__init__.py:63:21: W504 line break after binary operator

[colintheshots]

Feel free to fix this a better way as I didn't know Python at all until I worked on the blocklist parser. I didn't change sources.py, so I'm not sure why it's complaining about that.