After [29197], use `! empty()` instead of `isset()`. Don't call `has_shortcode()` internally twice if it's true.

Props kovshenin.
Fixes #26343.

Built from https://develop.svn.wordpress.org/trunk@29207


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After [29106], check for `data.meta` before attempting to render `data.meta.bitrate`.

See #28839.

Built from https://develop.svn.wordpress.org/trunk@29208


git-svn-id: http://core.svn.wordpress.org/trunk@28992 1a063a9b-81f0-0310-95a4-ce76da25c4cd