On Friday the 13th of July another effort to raise a whooping crane in captivity failed. The second of two chicks died six weeks after it was hatched at New Orleans' Audubon Park Zoo. When the chick popped from its egg on May 29 it was hardly the size of a robin. But only two days before its death from a common bird lung infection, when photographed with Parents Crip and Josephine, it weighed 4� pounds and stood 33� inches tall. After months of trial, triumph and tragedy, downcast Zoo Director George Douglass observed: "There must be something to this Friday the 13th business after all." But Douglass, in spite of discouragement, made one thing clear. They will all try again next year, hard and with hope.