Avoid sitemap.xml error on Search Console
Avoid sitemap.xml error on Search Console

1. Empty self-closing changefreq element is not allowed on Search Console
2. There is a possibility that $changefreq is set false if the attribute type is select


Former-commit-id: 7e5c9bb47f5fc6ec650a2a47c7470b8451812b33
Former-commit-id: ed850f2275327a3288e1a535cd0160a865e31747
triplei/concrete5-8,rikzuiderlicht/concrete5,jaromirdalecky/concrete5,haeflimi/concrete5,hissy/concrete5,olsgreen/concrete5,olsgreen/concrete5,mlocati/concrete5,deek87/concrete5,haeflimi/concrete5,haeflimi/concrete5,MrKarlDilkington/concrete5,biplobice/concrete5,triplei/concrete5-8,mlocati/concrete5,mainio/concrete5,biplobice/concrete5,jaromirdalecky/concrete5,a3020/concrete5,mainio/concrete5,concrete5/concrete5,KorvinSzanto/concrete5,mainio/concrete5,mlocati/concrete5,KorvinSzanto/concrete5,acliss19xx/concrete5,acliss19xx/concrete5,concrete5/concrete5,concrete5/concrete5,haeflimi/concrete5,biplobice/concrete5,deek87/concrete5,deek87/concrete5,KorvinSzanto/concrete5,olsgreen/concrete5,mlocati/concrete5,deek87/concrete5,concrete5/concrete5,MrKarlDilkington/concrete5,hissy/concrete5,jaromirdalecky/concrete5,hissy/concrete5,acliss19xx/concrete5,jaromirdalecky/concrete5,MrKarlDilkington/concrete5,hissy/concrete5,biplobice/concrete5,rikzuiderlicht/concrete5,triplei/concrete5-8,rikzuiderlicht/concrete5,a3020/concrete5