Improve handling of explicit null in hasProperty and getProperty helpers.

[In3luki]

What happened?

This is a regression from v11.

What ways of accessing Foundry can you encounter this issue in?

• [ ] Native App (Electron)
• [X] Chrome
• [X] Firefox
• [ ] Safari
• [ ] Other

Reproduction Steps

const object = {
  property: {
    inner: "value",
  }
}

const object2 = {
  property: null,
}

// v11
console.log(foundry.utils.getProperty(object, "property.inner")); // value
console.log(foundry.utils.getProperty(object2, "property.inner")); // undefined

// v12
console.log(foundry.utils.getProperty(object, "property.inner")); // value
console.log(foundry.utils.getProperty(object2, "property.inner")); // TypeError: Cannot use 'in' operator to search for 'inner' in null

What core version are you reporting this for?

Version 12 Build 320

Relevant log output

No response

Bug Checklist

• [X] The issue occurs while all Modules are disabled

[In3luki]

Apparently foundry.utils.hasProperty has the same problem.

[In3luki]

Related to #7813