fix after changing null -> blank

.pre-commit-config.yaml

@@ -1,40 +0,0 @@
-repos:
-- repo: local
-  hooks:
-  - id: poetry
-    name: poetry
-    language: system
-    entry: poetry check
-    files: '^(pyproject.toml|poetry.lock)$'
-    pass_filenames: false
-  # - id: black
-  #   name: black
-  #   language: system
-  #   entry: poetry run black --target-version py39 
-  #   types_or: [python, pyi]
-  #   require_serial: true
-  # - id: isort
-  #   name: isort
-  #   language: system
-  #   entry: poetry run isort --profile black --python-version 39
-  #   types_or: [cython, pyi, python]
-  #   require_serial: true
-  # - id: flake8
-  #   name: flake8
-  #   language: system
-  #   entry: poetry run flake8
-  #   types_or: [python]
-  #   files: "^.*\\.py$"
-  # - id: mypy
-  #   name: mypy
-  #   language: system
-  #   entry: poetry run mypy --strict --python-version 3.9
-  #   types_or: [python, pyi]
-  #   files: "^.*\\.pyi?$"
-  - id: test
-    name: test
-    language: system
-    entry: poetry run ./manage.py test
-    types_or: [python]
-    files: "^.*\\.py$"
-    pass_filenames: false