Cancelling before continuation

[hactar]

If one cancels a location task before it completes, the console shows an error before continuation.resume is never called:

SWIFT TASK CONTINUATION MISUSE: run() leaked its continuation!

You can test this by not keeping a reference to your task, for example:

    func refreshNearbyReports() async throws {
        
        do {
            let locationManager = Location()
            let location = try await locationManager.requestLocation()
       ...
   }

async let _ = try await refreshNearbyReports() // All tasks associated with this are immediately cancelled. 

This code change adds a new error case and calls .resume with it to ensure that the continuation does not leak if cancelled.