"Unexpected Parameter" `TypeError` when `target` is undefined

[nwhittaker]

The assert.dom() type allows for passing undefined as the target parameter:

assert.dom(undefined).exists();

However, doing so results in a TypeError:

TypeError: Unexpected Parameter: undefined
    at DOMAssertions.findElement (https://localhost:7357/assets/test-support.js:12711:15)
    at DOMAssertions.findTargetElement (https://localhost:7357/assets/test-support.js:12684:21)
    at DOMAssertions.hasText (https://localhost:7357/assets/test-support.js:12215:26)
    at Object.<anonymous> (https://localhost:7357/assets/tests.js:22408:20)

I'd expect invoking assert.dom in this way to behave the same way as invoking assert.dom() without any parameters.