if the image is unnamed, pass an nil slice to the parse repotags function instead of getting the image name by index.
after this patch, unnamed images will be shown as <none>
```
Images space usage:
REPOSITORY TAG IMAGE ID CREATED SIZE SHARED SIZE UNIQUE SIZE CONTAINERS
docker.io/library/ubuntu bionic 3556258649b2 11 days ago 66.6MB 0B 66.6MB 0
<none> <none> dd8a8db2c79b 11 days ago 986MB 66.6MB 919MB 0
```
Signed-off-by: Qi Wang <qiwan@redhat.com>
podman - Simple debugging tool for pods and images
podman is a daemonless container runtime for managing containers, pods, and container images.
It is intended as a counterpart to CRI-O, to provide low-level debugging not available through the CRI interface used by Kubernetes.
It can also act as a container runtime independent of CRI-O, creating and managing its own set of containers.
Use cases
Create containers
Start, stop, signal, attach to, and inspect existing containers
Run new commands in existing containers
Push and pull images
List and inspect existing images
Create new images by committing changes within a container
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