[basex-talk] Doc-available() function, behavior?

Dear Basex People,

I have this fragment:

let $xml-doc := 'MyDatabase/bogus-entry.xml' let $list := *if (doc-available($xml-doc)) then doc($xml-doc)/** else () return $list

I'd expect BaseX to return the empty sequence when the document is not in the collection. But Basex returns an error:

[basex:doc] Database path 'MyDatabase/bogus-entry.xml' yields no documents.

What am I doing wrong? I thought I was following the example in https://docs.basex.org/wiki/Databases#XML_Documents nicely...

Thanks in advance!!