Bug #499: Fix: Do not fetch username from user datatable if it is null.
Bug #499: Fix: Do not fetch username from user datatable if it is null.

larsks/opennebula-lks,larsks/opennebula-lks,larsks/opennebula-lks,larsks/opennebula-lks,larsks/opennebula-lks,larsks/opennebula-lks,larsks/opennebula-lks