Weston Ruter 8c9eb43d47 Customizer: Hide the transport list when it's empty, especially for screen readers.
Also prevent invalid markup for `.customize-section-description`.

Props valendesigns.
Fixes #32843.

Built from https://develop.svn.wordpress.org/trunk@33282


git-svn-id: http://core.svn.wordpress.org/trunk@33254 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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