year block creation in images widget can create cardinality error

Created by: GVogeler

http://monasterium.net/mom/IT-BSNSP/02-Atti_privati/images?block=1 creates an cardinality error sequence with more than one item is not allowed here [at line 161, column 26, source: /db/XRX.live/mom/app/illurkimages/images.xqm] In function: img:years(item()*)