Fix fake_dataset periodicity attribute in FieldDetector #4570
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PR Summary
The
FieldDetector
class mocks up a fake dataset from adefaultdict
if a dataset is not passed. It has to attach a number of basic yt attributes to thisfake_dataset
class, but at the end it tries to use theforce_periodicity
method, which of course exists on theDataset
class but not here. I'm just setting the periodicity here by hand, which is the previous behavior and should never have been changed here.I ran into this bug on accident--not sure if it affects anything, but this is the right fix for now until we do something better.
PR Checklist