Cope with pywb 2.0 sending blank closest sort order with blank value
Cope with pywb 2.0 sending blank closest sort order with blank value

nla/tinycdxserver,nla/tinycdxserver,nla/outbackcdx,nla/outbackcdx,nla/tinycdxserver,nla/outbackcdx,nla/outbackcdx,nla/tinycdxserver