Don't throw a Notice in calculateUri when passing an empty uri
Don't throw a Notice in calculateUri when passing an empty uri
staabm/sabre-dav,fruux/sabre-dav,fruux/sabre-dav,fruux/sabre-dav,PVince81/sabre-dav,staabm/sabre-dav,PVince81/sabre-dav,staabm/sabre-dav,PVince81/sabre-dav