notVisible assertion fails when selector doesn't match

[rodneyrehm]

The notVisible() assertion requires the element to be found in the DOM. If it can't find an element, the assertion fails. The docs should note this and the cirumstances an element is deemed invisible (CSS properties display and visible, what about the element being off-viewport or having no dimensions width:0;height:0;overflow:none etc pp.)

Should there be an assertion that unifies doesntExist() or notVisible() ?