if-none 0.0.3

Early break/continue/return if an optional expression evaluates to `None`.
Documentation
{
  "rules": {
    "subject-min-length": [
      2,
      "always",
      8
    ],
    "subject-max-length": [
      2,
      "always",
      50
    ],
    "subject-case": [
      2,
      "always",
      "sentence-case"
    ],
    "subject-full-stop": [
      2,
      "never",
      "."
    ],
    "body-max-line-length": [
      2,
      "always",
      72
    ],
    "footer-leading-blank": [
      2,
      "always"
    ]
  }
}