NpPdEncoder is broken and has never been fully exercised

[riastradh-probcomp]

bayeslite/src/loggers.py

Line 213 in 6d1293b

return {'mathjs' : 'Complex', 're' : x.real, 'im' : x.imag}

It attempts to use an undefined variable x. Presumably this was meant to be obj? Need to test and then fix.

[gregory-marton]

It's more broken than that: pandas-dev/pandas#12554