Skip build and deploy directly is not working as described

I'd like to avoid building automatically and deploying directly from a path, ideally I'd like to get an error if the path to be deployed is not existing or empty.

So I followed what is described in the README:

> Another option is to skip build, and deploy directly from a specific location. To do this, delete the target and configuration from azure.json, and provide a path with a value relative to the root of the project.

Prequisite: I first built with the configuration I need & "ng add ng-deploy-azure" run

If I only add "path", "ng run hello-world:deploy" is deploying without building as expected:

Example azure.json
> {
> "hosting": [
> {
> "app": {
> "project": "hello-world",
> "target": "build",
> "configuration": "production"
> "path": "public/static/hello-world"
> },
> "azureHosting": {
> ...
> }
> }
> ]
> }

But if I follow exactly what is described, I mean removing target & config, to avoid the automatic build, I got the following error message:

> Error when trying to deploy:
> Azure hosting config is missing some details. Please run "ng add ng-deploy-azure" and select a storage account.

Example azure.json
> {
> "hosting": [
> {
> "app": {
> "project": "hello-world",
> "path": "public/static/hello-world"
> },
> "azureHosting": {
> ...
> }
> }
> ]
> }

I'd like to know what should I keep and what I can remove from this file to achieve my goal : deploying without building and getting an error if the app has not been built before (path empty or not existing)?
I think that the README should be updated.
Thanks for your help