[Python-modules-team] Bug#915266: python-wither FTBFS with Pyrhon 3.7

[Adrian Bunk]

Source: python-wither
Version: 1.1-1
Severity: serious
Tags: ftbfs

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/python-wither.html

...
cd . && python3 setup.py build --build-base="/build/1st/python-wither-1.1/./build"
Warning: 'classifiers' should be a list, got type 'NoneType'
Traceback (most recent call last):
  File "setup.py", line 75, in <module>
    cmdclass = {'test': PyTest},
  File "/usr/lib/python3/dist-packages/setuptools/__init__.py", line 140, in setup
    return distutils.core.setup(**attrs)
  File "/usr/lib/python3.7/distutils/core.py", line 108, in setup
    _setup_distribution = dist = klass(attrs)
  File "/usr/lib/python3/dist-packages/setuptools/dist.py", line 370, in __init__
    k: v for k, v in attrs.items()
  File "/usr/lib/python3.7/distutils/dist.py", line 267, in __init__
    getattr(self.metadata, "set_" + key)(val)
  File "/usr/lib/python3.7/distutils/dist.py", line 1215, in set_classifiers
    self.classifiers = _ensure_list(value, 'classifiers')
  File "/usr/lib/python3.7/distutils/dist.py", line 40, in _ensure_list
    value = list(value)
TypeError: 'NoneType' object is not iterable
make: *** [/usr/share/cdbs/1/class/python-distutils.mk:78: debian/python-module-stampdir/python3-wither] Error 1