[BUG] regression in v2.23.0: docker compose config --hash=* prints empty result

[AkihiroSuda]

Description

Starting with v2.23.0, docker compose config --hash=* prints empty result.

This is a regression in commit a345515 (#11010)

Steps To Reproduce

Create a docker-compose.yaml like this:

services:
  hello1:
    image: alpine:3.13

v2.22.0 works as expected:

$ docker compose config --hash=*             
hello1 5bc8bc96d82232fd5546825b6e64c03b2074467edf89dc48be706283b8e4b4d6

v2.23.0 shows no result:

$ docker compose config --hash=*
(no output)

Compose Version

Docker Compose version v2.23.0

Docker Environment

(No dependency on the daemon)

Anything else?

No response