Report aria-label and aria-description even when parent has no visible children (#16471)
Fixes #14514
Summary of the issue:
HTML figure elements with no accessible children (EG, all children set to aria-hidden=true) but with an aria-label or aria-description are not reported by NVDA.
Description of user facing changes
Elements with no accessible children but which have a label or description are now reported in browse mode. Note this only applies to elements which are still rendered; if all children are set to display: none, for example, NVDA still does not report the parent element.
Description of development approach
Render a single space in elements with no content but a label or description se