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v3.0.1 build failure due to the test test_blank_choices failing

See original GitHub issue

From the recent build logs I see this test failure:

======================================================================
ERROR: test_blank_choices (wtfpeewee.tests.WTFPeeweeTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/coleifer/wtf-peewee/wtfpeewee/tests.py", line 231, in test_blank_choices
    self.assertTrue(form.validate())
  File "/home/travis/virtualenv/python3.6.7/lib/python3.6/site-packages/wtforms/form.py", line 318, in validate
    return super(Form, self).validate(extra)
  File "/home/travis/virtualenv/python3.6.7/lib/python3.6/site-packages/wtforms/form.py", line 150, in validate
    if not field.validate(self, extra):
  File "/home/travis/virtualenv/python3.6.7/lib/python3.6/site-packages/wtforms/fields/core.py", line 215, in validate
    self.pre_validate(form)
  File "/home/travis/build/coleifer/wtf-peewee/wtfpeewee/fields.py", line 187, in pre_validate
    super(SelectChoicesField, self).pre_validate(form)
  File "/home/travis/virtualenv/python3.6.7/lib/python3.6/site-packages/wtforms/fields/core.py", line 509, in pre_validate
    for _, _, match in self.iter_choices():
  File "/home/travis/build/coleifer/wtf-peewee/wtfpeewee/fields.py", line 163, in iter_choices
    yield (value, label, self.coerce(value) == self.data)
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'

I bumped into this myself because I tried to install buku in NixOS, and the wtf-peewee module (being a dependency of buku) in NixOS was just upgraded from 3.0.0 to 3.0.1 leading to the build failing.

I’m making this issue to let you know about the build failure in case you missed it. I’ll look into the test failure myself, but perhaps not tonight 😃