Fix crash when refreshing profile before it has loaded

Tusker/Screens/Profile/ProfileStatusesViewController.swift

@@ -100,7 +100,7 @@ class ProfileStatusesViewController: UIViewController, TimelineLikeCollectionVie
                     }
                 case .loading:
                     break
-                case .loaded, .addedHeader:
+                case .loaded, .setupInitialSnapshot:
                     var snapshot = dataSource.snapshot()
                     snapshot.reconfigureItems([.header(id)])
                     dataSource.apply(snapshot, animatingDifferences: true)
@@ -183,7 +183,7 @@ class ProfileStatusesViewController: UIViewController, TimelineLikeCollectionVie
         snapshot.appendItems([.header(accountID)], toSection: .header)
         await apply(snapshot, animatingDifferences: false)
         
-        state = .addedHeader
+        state = .setupInitialSnapshot
         
         await controller.loadInitial()
         await tryLoadPinned()
@@ -225,6 +225,12 @@ class ProfileStatusesViewController: UIViewController, TimelineLikeCollectionVie
     }
     
     @objc func refresh() {
+        guard case .loaded = state else {
+            #if !targetEnvironment(macCatalyst)
+            collectionView.refreshControl?.endRefreshing()
+            #endif
+            return
+        }
         Task {
             // TODO: coalesce these data source updates
             // TODO: refresh profile
@@ -242,7 +248,7 @@ extension ProfileStatusesViewController {
     enum State {
         case unloaded
         case loading
-        case addedHeader
+        case setupInitialSnapshot
         case loaded
     }
 }