--oci mode fails with no passwd file in container

[dtrudg]

Version of Singularity
3.11.0-rc.2

Describe the bug

$ singularity run --oci docker://hello-world
Getting image source signatures
Copying blob 2db29710123e done  
Copying config 811f3caa88 done  
Writing manifest to image destination
Storing signatures
2023/02/06 15:18:44  info unpack layer: sha256:2db29710123e3e53a794f2694094b9b4338aa9ee5c40b930cb8063a1be392c54
FATAL:   while creating passwd file: passwd file doesn't exist in container, not updating

This should be a WARNING, like non --oci mode...

$ singularity run docker://hello-world
INFO:    Converting OCI blobs to SIF format
INFO:    Starting build...
2023/02/06 15:19:40  info unpack layer: sha256:2db29710123e3e53a794f2694094b9b4338aa9ee5c40b930cb8063a1be392c54
INFO:    Creating SIF file...
WARNING: passwd file doesn't exist in container, not updating
WARNING: group file doesn't exist in container, not updating

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
    (amd64)
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

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