[podman-remote] command images --digests: DIGEST column shows nothing

[Edward5hen]

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

Description
podman-remote images --digest does not work well as the title describes.

Steps to reproduce the issue:

1. Set up the environment both for podman node and remote node refer to the tutorial.

2. On remote node:
   PODMAN_VARLINK_ADDRESS="tcp:127.0.0.1:1234" bin/podman-remote images --digests

Describe the results you received:

REPOSITORY                                                           TAG      DIGEST   IMAGE ID       CREATED       SIZE
brew-pulp-docker01.web.prod.ext.phx2.redhat.com:8888/rhel7/rsyslog   7.6-18            f4ff05b9d3b0   2 weeks ago   234 MB
registry.access.redhat.com/rhel7/net-snmp                            latest            4e6608c46567   2 weeks ago   279 MB
registry.access.redhat.com/rhel7/sadc                                latest            8e3f8e21cc86   2 weeks ago   227 MB
docker.io/library/httpd                                              latest            2d1e5208483c   2 weeks ago   137 MB
docker.io/library/busybox                                            latest            d8233ab899d4   5 weeks ago   1.42 MB

Describe the results you expected:

REPOSITORY                                                           TAG      DIGEST                                                                    IMAGE ID       CREATED       SIZE
brew-pulp-docker01.web.prod.ext.phx2.redhat.com:8888/rhel7/rsyslog   7.6-18   sha256:72de7dddc1a8f1f6242fc101efd310e256b3b5b7b2fe455c8b7efcb2c87cd965   f4ff05b9d3b0   2 weeks ago   234 MB
registry.access.redhat.com/rhel7/net-snmp                            latest   sha256:01625a040e8b4f19c5711f8cf6433010b1ea68fb985445ae5ce038920533176e   4e6608c46567   2 weeks ago   279 MB
registry.access.redhat.com/rhel7/sadc                                latest   sha256:078f536ce60e80444f89d7568fe0ffac46b893f88b273903a37a612f42c74aec   8e3f8e21cc86   2 weeks ago   227 MB
docker.io/library/httpd                                              latest   sha256:d93278029af342292a3af350bfb3d89edbe064f1d5c82f6841cb6abf79902875   2d1e5208483c   2 weeks ago   137 MB
docker.io/library/busybox                                            latest   sha256:4415a904b1aca178c2450fd54928ab362825e863c0ad5452fd020e92f7a6a47e   d8233ab899d4   5 weeks ago   1.42 MB

Additional environment details (AWS, VirtualBox, physical, etc.):
I built podman from source both on podman node side and remote node side.