On `19.2` we pass an undefined value to the text-field.
But more generaly, the CVA should protect itself if it doesn't recieve an `undefined` value.
fixes#61299
PR Close#61300
To increase the ease of development we are moving @angular/docs into the adev directory within this repo. While
we are doing this to improve our development experience in the short term, efforts are also in place
to maintain a division between this @angular/docs (shared) code and adev itself, so that it can be extracted
back out in the future when components is ready to leverage it as well.
PR Close#57132
