Change "null" writer output from None to the empty string.
tree0206a05e589867fa1a0fd543b8cd781c3c887e9b
-rw-r--r-- 3204 .flake8
-rw-r--r-- 1662 .gitattributes
-rw-r--r-- 393 .gitignore
-rw-r--r-- 584 .pre-commit-config.yaml
drwxr-xr-x - docutils
drwxr-xr-x - sandbox
drwxr-xr-x - web