dci-diff-jobs: lookup NULL fields for job comparisons
dci-diff-jobs: lookup NULL fields for job comparisons

Depends-On: Ic98974e366028f266712822c67ccf7a5cc12a99a
Change-Id: Ia7e25060800ff768030a70c0959b196c3dd4797c

redhat-cip/python-dciclient,redhat-cip/python-dciclient