message: Don't panic when calculating multinomial
diff: @@ -697,12 +697,9 @@ pub fn binomial<T: Integer + Clone>(mut n: T, k: T) -> T {
  }
  /// Calculate the multinomial coefficient.
  -///
  -/// Panics if no integers are specified.
  pub fn multinomial<T: Integer + Clone>(k: &[T]) -> T
  where for<'a> T: Add<&'a T, Output = T>
  {
  - assert!(k.len() > 0, "need at least one integer");
  let mut r = T::one();
  let mut p = T::zero();
  for i in k {
  @@ -865,6 +862,7 @@ fn test_multinomial() {
  check_multinomial!(i64, &[2, 1, 2], 30);
  check_multinomial!(i64, &[2, 3, 0], 10);
  + check_multinomial!(u64, &[], 1);
  check_multinomial!(u64, &[0], 1);
  check_multinomial!(u64, &[12345], 1);
  }
  