fix type errors in pandas/tests/extension/json/array.py#31718

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WillAyd merged 1 commit intopandas-dev:masterfrom

SaturnFromTitan:28926-fix-mypy-errors-for-pandas-tests-extension-json-array

Feb 5, 2020

Commits on Feb 5, 2020

added type annotation to JSONDtype.na_value
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