fix(cli)!: ignore empty scope by default

[KeisukeYamashita]

Why

Scope is optional in Conventional Commits 1.0.0:

<type>[optional scope]: <description>

[optional body]

[optional footer(s)]

Thus, the scope should be completely emptyable.
This is a part of #355.

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📥 Commits

Files that changed from the base of the PR and between 8acb4fe and 27d1fe1.

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[KeisukeYamashita]

Ah, we don't need it, its already added:

commitlint-rs/src/rule.rs

Line 200 in 27d1fe1

scope_empty: None,