In /api/storagedomains, there is a <data_centers> node without href attributes: <data_centers> <data_center id="00000001-0001-0001-0001-000000000311"/> </data_centers> There is a similar issue in /api/vms with the <hosts> node: <hosts> <host id="7620720b-eb29-4905-b5e8-c9b00ddb1e47"/> </hosts>
Patch posted: https://gerrit.ovirt.org/#/c/81376/
Verified that all <data_center> nodes have href attribute. Version 4.2.0-0.0.master.20171108151837.gita7de53e.el7.centos.
This bugzilla is included in oVirt 4.2.0 release, published on Dec 20th 2017. Since the problem described in this bug report should be resolved in oVirt 4.2.0 release, published on Dec 20th 2017, it has been closed with a resolution of CURRENT RELEASE. If the solution does not work for you, please open a new bug report.