ALBANY, N.Y. — The production of “Wedding Band” by Black Theatre Troupe of Upstate NewYork shows why Alice Childress’s work took almost 10 years to find someone brave enough to produce it. It’s difficult to think of many plays that so boldly explore the hatred between races. This is a no-holds-barred portrait of a love affair between a black woman and a white man that takes place in 1918 in South Carolina. It shows that even love can be crushed …