* doc/org-manual.org (Type): Document empty vector argument for
file-desc.
* etc/ORG-NEWS (New argument for ~file-desc~ babel header): Add entry
to NEWS.
* lisp/ob-core.el (org-babel--file-desc): Add new function to evaluate
file description value.
(org-babel-execute-src-block): Correctly evaluate file description
when executing src block.
(org-babel-insert-result): Correctly evaluate file description value
when inserting the result of src block execution into the buffer.
* testing/lisp/test-ob.el (test-ob/file-desc-header-argument): Add
test case for new behavior.
d9884cfa70