Fix popup over issue if height is set to auto
Fix popup over issue if height is set to auto

mcl-de/jquery-ui-multiselect-widget,GerHobbelt/jquery-multiselect,mcl-de/jquery-ui-multiselect-widget,r4j4h/jquery-ui-multiselect-widget,GerHobbelt/jquery-multiselect,mcl-de/jquery-ui-multiselect-widget,GerHobbelt/jquery-multiselect,r4j4h/jquery-ui-multiselect-widget