az functionapp deployment source config-zip fails with AttributeError: 'NoneType' object has no attribute 'lower'

Using latest azure-cli I cannot deploy to a functionapp using cli locally. Update to latest azure-cli did not work as specified here: https://github.com/Azure/azure-cli/issues/10773

This is autogenerated. Please review and update as needed.

Describe the bug

Command Name az functionapp deployment source config-zip

Errors:

The command failed with an unexpected error. Here is the traceback:
'NoneType' object has no attribute 'lower'
Traceback (most recent call last):
  File "/opt/az/lib/python3.10/site-packages/knack/cli.py", line 231, in invoke
    cmd_result = self.invocation.execute(args)
  File "/opt/az/lib/python3.10/site-packages/azure/cli/core/commands/__init__.py", line 663, in execute
    raise ex
  File "/opt/az/lib/python3.10/site-packages/azure/cli/core/commands/__init__.py", line 726, in _run_jobs_serially
    results.append(self._run_job(expanded_arg, cmd_copy))
  File "/opt/az/lib/python3.10/site-packages/azure/cli/core/commands/__init__.py", line 697, in _run_job
    result = cmd_copy(params)
  File "/opt/az/lib/python3.10/site-packages/azure/cli/core/commands/__init__.py", line 333, in __call__
    return self.handler(*args, **kwargs)
  File "/opt/az/lib/python3.10/site-packages/azure/cli/core/commands/command_operation.py", line 121, in handler
    return op(**command_args)
  File "/opt/az/lib/python3.10/site-packages/azure/cli/command_modules/appservice/custom.py", line 522, in enable_zip_deploy_functionapp
    remove_remote_build_app_settings(cmd, resource_group_name, name, slot)
  File "/opt/az/lib/python3.10/site-packages/azure/cli/command_modules/appservice/custom.py", line 645, in remove_remote_build_app_settings
    value = keyval['value'].lower()
AttributeError: 'NoneType' object has no attribute 'lower'

To Reproduce:

Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

• Put any pre-requisite steps here…
• az functionapp deployment source config-zip --src {} --subscription {} --resource-group {} --name {}

Expected Behavior

Environment Summary

Linux-5.10.102.1-microsoft-standard-WSL2-x86_64-with-glibc2.31, Ubuntu 20.04 LTS
Python 3.10.4
Installer: DEB

azure-cli 2.37.0

Additional Context

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[RakeshMohanMSFT]

@markhoratiowalmsley Thank you for reaching out, we are looking into it.

[leadpony]

@RakeshMohanMSFT

I reproduced the problem with the latest version: 2.41.0.

The functionapp as a deployment target is configured as follows:

• Stack: custom docker image
• Registry source: Azure Container Registry
• Registry authentication: Admin Credentials
• Set WEBSITE-ENABLE_APP_SERVICE_STORAGE in the appsettings to true, for deploying the app under /home

Please see the article https://learn.microsoft.com/en-us/azure/app-service/configure-custom-container?pivots=container-linux#configure-environment-variables

If your app uses images from a private registry or from Docker Hub, credentials for accessing the repository are saved in environment variables: DOCKER_REGISTRY_SERVER_URL, DOCKER_REGISTRY_SERVER_USERNAME and DOCKER_REGISTRY_SERVER_PASSWORD. Because of security risks, none of these reserved variable names are exposed to the application.

Functionapp services automatically replace the value of DOCKER_REGISTRY_SERVER_* in the appsettings with null, which is mapped to None in the Azure CLI. NoneType object has no attribute lower in Python.

Could you please reopen this issue?