vCD-vApp-VM get-metadata only returns one entry

[pille]

Describe the bug

the task

    - name: get vApp VM metadata
      delegate_to: localhost
      vcd_vapp_vm:
        operation: "get_meta"
        target_vm_name: "{{ vcd_vm_name }}"
        target_vdc: "{{ vcd_vdc }}"
        target_vapp: "{{ vcd_vapp }}"

will only return one metadata entry, even if there are more.
it fails, when none is available.
documentation is also buggy, as it states one should use vcd_vapp-module.

Reproduction steps

see above

Expected behavior

return all entries and don't fail when none is available.
also c'n'p failure in docs should be fixed.

Additional context

No response