BILL Blass was saved by timing. At 11:30 a.m., half an hour after his rumored-to-be-final collection was scheduled to start, the Bryant Park tent was still only half full, thanks to the weather. Sensibly the 7th Avenue stalwart delayed yet a further half hour, by which time the place filled up. If this was his goodbye, it was a triumphant one. Bill Blass showed clothes made for wear on the sunny side of the street. Best among Blass’ cheery, colorful clothes were ruffled, floral print dresses in fun Sno Cone colors. At the end, people cried. –