plugins/removeHiddenElems: check for an empty values too
plugins/removeHiddenElems: check for an empty values too

akatopo/svgo,pgherveou/svgo,ricardobeat/svgo,jagan-veeraraghavan/svgo,subzey/svgo,ben-eb/svgo,pieter-lazzaro/svgo,ennett50/svgo,svg/svgo,PeterWangPo/svgo,allypalanzi/svgo,OrangeLV/svgo,svg/svgo,WebTwist/svgo,bORm/svgo