I have a question on how much quota is charged for certain failed operations. The documented statement:

"If a request results in an error, the requested operations count against your quota unless the error is due to a system failure on Google's side."

seems a little general. For example, suppose I issue a request to getAllAdGroups, but pass a non-existent campaign id. No items are returned, obviously. Are any quota points used by this operation?

Thanks for any clarification.