Ticket 50627 - Support platforms without pytest_html
    
    Bug Description: On systems without pytest_html the conftest
    hook would cause tests to fail
    
    Fix Description: If pytest_html is none, don't write the report
    to avoid the failure.
    
    Fixes: https://pagure.io/389-ds-base/issue/50627
    
    Author: William Brown <william@blackhats.net.au>
    
    Review by: vashirov