Sieve, test "No_primes_under_two" is incorrect

[HugoRoss]

There should not be an ArgumentOutOfRangeException expected in unit test "No_primes_under_two" of exercise "Sieve". In my opinion the question "Give me all primes up to the number of 1" is absolutely okay and should return an empty array instead of throwing an Exception.

An ArgumentOutOfRangeException may be thrown for negative numbers if they are not supported.

[ErikSchierboom]

Closed by #1566