Review or magazine articles with no volume number

Dear community,
I am currently working on a book for a publisher that uses the "Presses Universitaires de Rennes (français)" style. I find that there may be a mistake in the style as refers review articles and magazine articles with no volume number: in the example below, you can see that there is a double comma between the review title and the review number. Is there an easy way to fix this?
Many thanks in advance!
David

IVANCICH Norberto, « El FRP y La Tablada: el Prode que se sacaron los militares », Unidos, , no 20, avril 1989, 04/1989 p. ; LÓPEZ Ernesto, « Reflexiones sobre La Tablada », Unidos, , no 20, avril 1989, p. 68‑74.
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