format_article requires optional fields volume and pages

The Volume and Pages fields are optional fields but the way format_article function is written, they are required. http://www.spinellis.gr/res/cite/indexw.htm

The following changes fix the problem: - join [field('volume'), optional [':', pages]], - words ['pages', optional [pages]] + join [optional_field('volume'), optional [':', pages]], + optional [words ['pages', pages]]

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