Warning when deleting attributes included in products query/facets

[A-Kold]

Is your feature request related to a problem? Please describe.
When a customer deletes an attribute we would like a warning in cases where the attributes is specifically used in a query for frontend. The reason is that if an attribute is a part of that, the frontend will break.

Describe the solution you'd like
settings --> Ecommerce --> Product catalog --> productfields (or category fields)
When wanting to delete attributes there are no warning/indication that the attribute is used as either filter, or specifically in the query showing the products. This can lead to attributes being deleted that are still a part of the productsquery or a facet which will make the frontend crash.

Describe alternatives you've considered
An indication on the attribute that it is used in Facets, or the productsquery.
Alternatively a warning that shows where the attributes is used in a Productsquery or Facets.

[nicped]

If the frontend breaks when an attribute is missing, it is a bug. It should not fail, just be ignored. I think we have fixed that actually in some recent release