Sergey Biryukov 8532edd526 Docs: Further clarify return results for a non-existing ID in metadata functions. ...

This adds a note that the functions return either an empty array or an empty string for a valid but non-existing ID, depending on the `$single` parameter.

Follow-up to [48658], [50641].

Props rodrigosprimo, jrf.
See #61608.
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