oc get images --show-labels doesn't show labels

[cben]

--show-labels works for most resource types but not images — it only adds a LABELS headers but doesn't actually add a column with labels.

Version

oc v3.7.0+7ed6862
kubernetes v1.7.6+a08f5eeb62
features: Basic-Auth GSSAPI Kerberos SPNEGO

Server https://192.168.99.100:8443
openshift v3.7.0+7ed6862
kubernetes v1.7.6+a08f5eeb62

(via minishift 1.9.0)

Steps To Reproduce

$ oc label image sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358 foo=bar
$ oc get images 
NAME                                                                      DOCKER REF
sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358   centos/ruby-24-centos7@sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358
sha256:0ba509791429be8e2ad63eed6012e391a42b69ef710b8f4815d321b84f069166   openshift/wildfly-100-centos7@sha256:0ba509791429be8e2ad63eed6012e391a42b69ef710b8f4815d321b84f069166
...
$  oc get images --show-labels
NAME                                                                      DOCKER REF   LABELS
sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358   centos/ruby-24-centos7@sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358
sha256:0ba509791429be8e2ad63eed6012e391a42b69ef710b8f4815d321b84f069166   openshift/wildfly-100-centos7@sha256:0ba509791429be8e2ad63eed6012e391a42b69ef710b8f4815d321b84f069166
...
$ oc get images --template $'{{range .items}}{{.metadata.name}}\t{{.dockerImageReference}}\t{{.metadata.labels}}\n{{end}}' | column -t -s $'\t'
sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358  centos/ruby-24-centos7@sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358           map[foo:bar]
sha256:0ba509791429be8e2ad63eed6012e391a42b69ef710b8f4815d321b84f069166  openshift/wildfly-100-centos7@sha256:0ba509791429be8e2ad63eed6012e391a42b69ef710b8f4815d321b84f069166    <no value>
...

Current Result

NAME                                                                      DOCKER REF   LABELS
sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358   centos/ruby-24-centos7@sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358

Expected Result

NAME                                                                      DOCKER REF   LABELS
sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358   centos/ruby-24-centos7@sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358   foo=bar

P.S. custom-columns doesn't help

This is the kind of thing where custom-columns could be friendlier than go templates, but alas it fails if any of the images has no labels. Is it because of omitempty and jsonpath expressions not handling nil? I found no way to explicitly iterate over a map, nor a way to explicitly check for nil.
Is this why --show-labels was important in the first place?

$ oc get images -o 'custom-columns=NAME:.metadata.name,DOCKER REF:.dockerImageReference,LABELS:.metadata.labels' 
error: labels is not found
$ oc get images -o 'custom-columns=NAME:.metadata.name,DOCKER REF:.dockerImageReference,LABELS:.metadata.labels' sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358
NAME                                                                      DOCKER REF                                                                                       LABELS
sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358   centos/ruby-24-centos7@sha256:01eed3f3b8c323b6074c77256c82c7fb94293ff35c65bdde93a21bbcd4bad358   map[foo:bar]