Bump black from 21.11b1 to 21.12b0 (#275)

* Bump black from 21.11b1 to 21.12b0

Bumps [black](https://github.com/psf/black) from 21.11b1 to 21.12b0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/commits)

---
updated-dependencies:
- dependency-name: black
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

* Fix new black rule

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Rustem Saiargaliev <rustem.saiargaliev@voiio.de>

requirements_dev.txt

@@ -1,6 +1,6 @@
 -r requirements.txt
 
-black==21.11b1
+black==21.12b0
 flake8==4.0.1
 isort==5.10.1
 mypy==0.910

tests/generic/models.py

@@ -331,7 +331,6 @@ class DummyImageFieldModel(models.Model):
         fs = FileSystemStorage(location=gettempdir())
         image_field = models.ImageField(upload_to="%Y/%m/%d", storage=fs)
 
-
 else:
     # doesn't matter, won't be using
     class DummyImageFieldModel(models.Model):