Fix README TypeError when one container is running

[inknos]

closes #379

PTAL @jwhonce

[packit-as-a-service]

We were not able to find or create Copr project packit/containers-podman-py-395 specified in the config with the following error:

Cannot create a new Copr project (owner=packit project=containers-podman-py-395 chroots=['fedora-39-x86_64', 'fedora-rawhide-x86_64', 'fedora-40-x86_64']): Copr: 'packit/containers-podman-py-395' already exists

---

Please check your configuration for:

1. typos in owner and project name (groups need to be prefixed with @)
2. whether the project name doesn't contain not allowed characters (only letters, digits, underscores, dashes and dots must be used)
3. whether the project itself exists (Packit creates projects only in its own namespace)
4. whether Packit is allowed to build in your Copr project
5. whether your Copr project/group is not private

[jwhonce]

Suggested change

	container = client.containers.get(container.name)
	container.reload()

would also populate all the fields.

PS. The comment could also include a notice that sparse=True is our default. Future work could allow sparse=False on the list() call.

[inknos]

thanks @jwhonce, good idea. I committed new changes

[jwhonce]

LGTM

[rhatdan]

/approve
/lgtm

[openshift-ci]

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