Removing SCHEDULE-STATUS in some cases.
Removing SCHEDULE-STATUS in some cases.

When an iCalendar change is deemed 'insignificant' and no iTip delivery
system sent a message, or an error was triggered, the schedule-status
simply gets removed.

TheTypoMaster/sabre-dav,evert/sabre-dav,fkooman/sabre-dav,readdle/sabre-dav,jeremydenoun/sabre-dav,PVince81/sabre-dav,readdle/sabre-dav,evert/sabre-dav,fkooman/sabre-dav,n-6/sabre-dav,c0d3z3r0/sabre-dav,macressler/sabre-dav,PVince81/sabre-dav,staabm/sabre-dav,jeremydenoun/sabre-dav,n-6/sabre-dav,c0d3z3r0/sabre-dav,PVince81/sabre-dav,TheTypoMaster/sabre-dav,c0d3z3r0/sabre-dav,macressler/sabre-dav,kriswebdev/sabre-dav,staabm/sabre-dav,TheTypoMaster/sabre-dav,kriswebdev/sabre-dav,n-6/sabre-dav,staabm/sabre-dav,readdle/sabre-dav,kriswebdev/sabre-dav,fruux/sabre-dav,jeremydenoun/sabre-dav,vmire/sabre-dav,vmire/sabre-dav,evert/sabre-dav,vmire/sabre-dav,macressler/sabre-dav,fruux/sabre-dav,fkooman/sabre-dav,fruux/sabre-dav