Json: fix handling of whitespace
Json: fix handling of whitespace

We just gobble up whitespace after various expressions as part of the lens
processing that expression.

domcleal/augeas,pevalme/augeas,mchf/augeas,MikaelSmith/augeas,GeoffWilliams/augeas,kumy/augeas,jjlin/augeas,hercules-team/augeas-do-not-use,lutter/augeas,domcleal/augeas,jasperla/augeas,hercules-team/augeas-do-not-use,lutter/augeas,ptoscano/augeas,manandbytes/augeas,mchf/augeas,jtopjian/augeas,kumy/augeas,kunkku/augeas,lutter/augeas,jtopjian/augeas,mlichvar/augeas,pevalme/augeas,manandbytes/augeas,mlichvar/augeas,pevalme/augeas,dafugg/augeas,jjlin/augeas,dafugg/augeas,hercules-team/augeas-do-not-use,raphink/augeas,jasperla/augeas,dafugg/augeas,kumy/augeas,hercules-team/augeas,ptoscano/augeas,kunkku/augeas,kunkku/augeas,domcleal/augeas,hercules-team/augeas,mlichvar/augeas,raphink/augeas,kumy/augeas,MikaelSmith/augeas,jjlin/augeas,GeoffWilliams/augeas,ptoscano/augeas