Handle 401 errors on instance timelines

Tusker/Screens/Timeline/InstanceTimelineViewController.swift

@@ -84,8 +84,23 @@ class InstanceTimelineViewController: TimelineViewController {
     // MARK: Timeline
     
     override func handleLoadAllError(_ error: Swift.Error) async {
-        switch (error as? Client.Error)?.type {
+        guard let error = error as? Client.Error else {
-        case .mastodonError(422, _), .unexpectedStatus(422):
+            await super.handleLoadAllError(error)
+            return
+        }
+        let code: Int
+        switch error.type {
+        case .mastodonError(let c, _), .unexpectedStatus(let c):
+            code = c
+        default:
+            await super.handleLoadAllError(error)
+            return
+        }
+        guard code == 422 || code == 401 else {
+            await super.handleLoadAllError(error)
+            return
+        }
+        
         collectionView.isHidden = true
         view.backgroundColor = .systemBackground
         
@@ -121,10 +136,6 @@ class InstanceTimelineViewController: TimelineViewController {
             view.safeAreaLayoutGuide.trailingAnchor.constraint(equalToSystemSpacingAfter: stack.trailingAnchor, multiplier: 1),
             stack.centerYAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerYAnchor),
         ])
-            
-        default:
-            await super.handleLoadAllError(error)
-        }
     }
     
     // MARK: Interaction