Proposed title of this feature request

ArgoCD should treat a deleted folder from repository as an "empty folder".

What is the nature and description of the request?

When we delete a folder from GitHub, the ArgoCD Application Complains that the app path doesn't exist.
We would like it to treat a deleted folder like an empty where it still tracks it and shows the objects that will be pruned, (In this case, everthing).
The reason being is we are using this to track kubernetes namespaces, and will be using prune policies to auto prune certain objects and keeps others when we delete a namespace, which is just a folder in GitHub.

Why does the customer need this? (List the business requirements here)

We use ArgoCD to manage namespace creation and base resources, when we delete a customers folder of resources, ArgoCD no longer shows details appropriately due to error, we also want to use ArgoCDs new feature of selective auto pruning, which if the deltas are not being calculated, won't work.

How would the customer like to achieve this? (List the functional requirements here)

A toggleable flag in the application CR, or somewhere else, open to ideas.

For each functional requirement listed, specify how Red Hat and the customer can test to confirm the requirement is successfully implemented.

Application doesn't error out when folder it is targting doesn't exist.

Would the customer be able to assist in testing this functionality if implemented?

Yes.