Github user BryanCutler commented on the issue:
https://github.com/apache/spark/pull/12790
@yanboliang and @MechCoder , I updated this to remove the default value for
the `stages` param to be consistent with Scala and also made the pydocs a
little more clear that the param needs to be a list and could be empty.
Now if `getStages()` is called and the param is not set, it will result in
a `KeyError` and indicate the `stages` param, instead of just giving
"TypeError: 'NoneType' object is not iterable" as before. This is consistent
with other PySpark params also.
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