Don't warn about missing page numbers for publisher articles.

web/src/ArticleSearchResult2.js

@@ -296,7 +296,7 @@ export class ArticleSearchResult2
                 const optional = [
                     [ () => parentMode === "publication" && newVals.pub_id === null, "No publication was specified.", refs.pub_id ],
                     [ () => parentMode === "publisher" && newVals.publ_id === null, "No publisher was specified.", refs.pub_id ],
-                    [ () => newVals.article_pageno === "" && newVals.pub_id !== null, "No page number was specified.", refs.article_pageno ],
+                    [ () => parentMode === "publication" && newVals.article_pageno === "" && newVals.pub_id !== null, "No page number was specified.", refs.article_pageno ],
                     [ () => newVals.article_pageno !== "" && newVals.pub_id === null, "A page number was specified but no publication.", refs.pub_id ],
                     [ () => newVals.article_pageno !== "" && !isNumeric(newVals.article_pageno), "The page number is not numeric.", refs.article_pageno ],
                     [ () => newVals.publ_id && newVals.article_date === "", "The article date was not specified.", refs.article_date ],