Fixes minor issues
    
    Fixes issues discovered by Coverity
    
    plugins/baseldap.py:      possible undefined value in return
    certmonger.py:            possible dereference of None value
    i18n.py:                  fixed always True bug (+ cosmetic change)
    
    https://fedorahosted.org/freeipa/ticket/5661
    
    Reviewed-By: Jan Cholasta <jcholast@redhat.com>
    Reviewed-By: Martin Basti <mbasti@redhat.com>