…LUES

…stance() returns None

(no idea why it does sometimes: buggy dll?)

Workaround: in case of failure, avoid PyICU use in parsedatetime

Traceback below:
    column_types = TypeTester(force=column_types)
  File "/usr/local/lib/python3.8/site-packages/agate/type_tester.py", line 68, in __init__
    Date(),
  File "/usr/local/lib/python3.8/site-packages/agate/data_types/date.py", line 34, in __init__
    self._constants = parsedatetime.Constants(localeID=self.locale, usePyICU=True)
  File "/usr/local/lib/python3.8/site-packages/parsedatetime/__init__.py", line 2381, in __init__
    self.locale = get_icu(self.localeID)
  File "/usr/local/lib/python3.8/site-packages/parsedatetime/pdt_locales/icu.py", line 100, in get_icu
    result['timeFormats'][x] = icu_tf[x].toPattern()
AttributeError: 'NoneType' object has no attribute 'toPattern'

…teTimeInstance() returns None"

This reverts commit 15296f1.