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original.java

public static <B> Set<List<B>> cartesianProduct(
    List<? extends Set<? extends B>> sets) {
  CartesianSet<B> cartesianSet = new CartesianSet<B>(sets);
  return cartesianSet.isEmpty() ? ImmutableSet.<List<B>>of() : cartesianSet;
}}

modified.java

public static <B> Set<List<B>> cartesianProduct(
    List<? extends Set<? extends B>> sets) {
  for (Set<? extends B> set : sets) {
    if (set.isEmpty()) {
      return ImmutableSet.of();
    }
  }
  CartesianSet<B> cartesianSet = new CartesianSet<B>(sets);
  return cartesianSet;
}}