Issue 49159 - test_schema_comparewithfiles fails with python-ldap>=2.4.26
    
    Bug Description:
    comparewithfiles test from Schema test suite fails on 99user.ldif
    with newer versions of python-ldap (2.4.26 and higher).
    
    Fix Description:
    Handle exception gracefully.
    
    https://pagure.io/389-ds-base/issue/49159
    
    Reviewed by: mreynolds (Thanks!)