CLOUDSTACK-1989: Without this fix you can't query service offerings that don't have a domain id set (null).
CLOUDSTACK-1989: Without this fix you can't query service offerings
that don't have a domain id set (null).

Tested via: Called "listServiceOfferings" using a simple perl script,
once with an ID, and once without an ID specified.

Signed-off-by: Chip Childers <35ca53bee0d0334aac4006bf153ffb519bf555be@gmail.com>

DaanHoogland/cloudstack,mufaddalq/cloudstack-datera-driver,GabrielBrascher/cloudstack,resmo/cloudstack,DaanHoogland/cloudstack,resmo/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,resmo/cloudstack,mufaddalq/cloudstack-datera-driver,wido/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack,resmo/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,wido/cloudstack,wido/cloudstack,mufaddalq/cloudstack-datera-driver,DaanHoogland/cloudstack,jcshen007/cloudstack,GabrielBrascher/cloudstack,resmo/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,wido/cloudstack,mufaddalq/cloudstack-datera-driver,mufaddalq/cloudstack-datera-driver,mufaddalq/cloudstack-datera-driver,wido/cloudstack,jcshen007/cloudstack,resmo/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,resmo/cloudstack