charmcraft list-lib does not work without a metadata.yaml file

[DanielArndt]

Bug Description

The command charmcraft list-lib seems to expect the charm name to be in a metadata.yaml file, but newer charms do not have this file, as everything is in charmcraft.yaml.

To Reproduce

1. Go to a directory which contains a charm with only a charmcraft.yaml file (no metadata.yaml)
2. Run charmcraft list-lib

Environment

Latest charmcraft (3a09483)

charmcraft.yaml

# This file configures Charmcraft.
# See https://juju.is/docs/sdk/charmcraft-config for guidance.

name: listlibs
type: charm
title: Charm Template
summary: A very short one-line summary of the charm.
description: |
  A single sentence that says what the charm is, concisely and memorably.

  A paragraph of one to three short sentences, that describe what the charm does.

  A third paragraph that explains what need the charm meets.

  Finally, a paragraph that describes whom the charm is useful for.
bases:
  - build-on:
    - name: ubuntu
      channel: "22.04"
    run-on:
    - name: ubuntu
      channel: "22.04"
config:
  options:
    log-level:
      description: |
        Configures the log level of gunicorn.

        Acceptable values are: "info", "debug", "warning", "error" and "critical"
      default: "info"
      type: string
containers:
  httpbin:
    resource: httpbin-image
resources:
  httpbin-image:
    type: oci-image
    description: OCI image for httpbin
    upstream-source: kennethreitz/httpbin

Relevant log output

Can't access name in 'metadata.yaml' file. The 'list-lib' command must either be executed from a valid project directory, or specify a charm name using the --charm-name option.