public static void sortNullsFirst( List list, String sortBy ) {
        sort( list, sortBy, true, true);
    }
public static void sortNullsFirst ( List list , String sortBy ) { sort ( list , sortBy , true , true ) ; }
Sorts lists Ascending Null first
Nulls first.

@param list the list you want to sort
@param sortBy what you want to sort the list by