Removed useless throw-if-null exception

Author: fdij

src/ProgressOnderwijsUtils/Data/ParameterizedSql.cs

@@ -96,7 +96,6 @@ static bool ValidSubsequentIdentifierChar(char c) //https://learn.microsoft.com/
     /// </summary>
     public static ParameterizedSql UnescapedSqlIdentifier(string rawSqlString)
     {
-        ArgumentNullException.ThrowIfNull(nameof(rawSqlString));
         AssertIsIdentifier(rawSqlString, 0);
         return new StringSqlFragment(rawSqlString).BuildableToQuery();
     }