Section 19-16 - Appearance and answer; default judgment(a) On or before the return date specified in the summons issued pursuant to this Article, or within 15 days after the service of such summons, or within 15 days after receiving actual notice of the issuance of such summons, the author, publisher or any person interested in sending or causing to be sent, bringing or causing to be brought, into this State for sale or distribution or disseminating in any manner, or any person in this State preparing, selling, offering, exhibiting or commercially distributing, or disseminating in any manner or possessing with intent to sell, offer or commercially distribute or exhibit or disseminate in any manner the material attached as an exhibit to the endorsed complaint, may appear and may intervene as a respondent and file an answer.(b) If, after service of summons has been effected upon all respondents, no person appears and files an answer on or before the return date specified in the summons, the court may forthwith adjudge whether the material so exhibited to the endorsed complaint is harmful to minors and enter an appropriate final judgment.