Fixed untilStringToDate error handling.
Fixed untilStringToDate error handling.

teambition/rrule,clochix/rrule,clochix/rrule,psnider/rrule,teambition/rrule,moisadoru/rrule,amyhua/rrule,bendavis78/rrule,jkbrzt/rrule,jkbrzt/rrule,Ribeiro/rrule,psnider/rrule,amyhua/rrule,nehakadam/rrule,nehakadam/rrule,TeamPraxis/rrule,moisadoru/rrule,Ribeiro/rrule,bendavis78/rrule,TeamPraxis/rrule