Empty scope doesn't fail PR lint action

[wolfm89]

Expected Behavior

A PR with title feat(): My description should fail the action due to missing scope.
The conventional commit specification says:

A scope MAY be provided after a type. A scope MUST consist of a noun describing a section of the codebase surrounded by parenthesis, e.g., fix(parser):

This is also how it's implemented in many other checkers (https://github.com/conventional-changelog/commitlint/blob/28bac3ea619e010ce1a3dbd08502588138ef9b74/%40commitlint/rules/src/scope-empty.test.ts#L35) and regex definitions (https://gist.github.com/marcojahn/482410b728c31b221b70ea6d2c433f0c)

Current Behavior

PR action doesn't fail on empty scope.

Steps to Reproduce

Create a PR with title feat(): My description and run this action on it.

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