LDAPArrayIterator behaves incorrectly when initialized with an empty array

Currently, the LDAPArrayIterator() of an empty array is not equal to an empty LDAPArrayIterator(). This causes it code that uses it as a begin iterator in iterator traversal to return the wrong results.

Example:

char* empty[] = { 0 };

LDAPArrayIterator(empty) != LDAPArrayIterator()