Audit rules to ensure correct behavior when no meta object present

[bmish]

This is a bit of an edge case but I suspect some rules aren't handling it properly. Ensure each rule has tests of this situation.

Note: this does not block the upcoming major release.

[aladdin-add]

function-style rules were not recommended (and not documented?), not sure it's worth too many efforts to cover it.

and, we already have rule prefer-object-rule.

[bmish]

I was actually referring to object-style rules that are missing a meta object, as below:

module.exports = {
  create() {}
}

It's rare that a rule would be left like this, but especially when writing a new rule, the meta object might not be added yet, so we want to make sure existing rules don't crash.

[aladdin-add]

👍 makes sense!