Wrong help for (bim:get-all-stories )?

The Online-help writes

if building is an empty string "" or "*", all stories defined in the current drawing are returned.

But an empty string is not accepted:

: (bim:get-all-stories "")
; ----- Error around expression -----
(BIM:GET-ALL-STORIES "")
;
; error : bad argument type <""> ; expected <STRING> at [bim:get-all-stories]

: (bim:get-all-stories "*")
("Basement" "Basement" "Basement" "First Floor" "First Floor" "First Floor" "Floor 1" "Floor 2" "Floor 3" "Roof" "Roof" "Roof" "Second Floor" "Second Floor" "Second Floor")

Wrong help or wrong usage?

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