Added exception handling for mal-formatted XML Parsing
In order to handle mal-formatted XML returned from Dogtag, added
exception handling around etree.fromstring function.
https://fedorahosted.org/freeipa/ticket/5885
Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>
Reviewed-By: Martin Basti <mbasti@redhat.com>