Add placeholders

Model/Applications/PipedAPI.swift

@@ -232,6 +232,8 @@ final class PipedAPI: Service, ObservableObject, VideosAPI {
             if let channel = extractChannel(from: content) {
                 return ContentItem(channel: channel)
             }
+        default:
+            return nil
         }
 
         return nil

Model/Applications/VideosAPI.swift

@@ -74,6 +74,8 @@ extension VideosAPI {
         case .playlist:
             urlComponents.path = "/playlist"
             queryItems.append(.init(name: "list", value: item.playlist.id))
+        default:
+            return nil
         }
 
         if !time.isNil, time!.seconds.isFinite {

Model/ContentItem.swift

@@ -2,7 +2,7 @@ import Foundation
 
 struct ContentItem: Identifiable {
     enum ContentType: String {
-        case video, playlist, channel
+        case video, playlist, channel, placeholder
 
         private var sortOrder: Int {
             switch self {
@@ -35,6 +35,6 @@ struct ContentItem: Identifiable {
     }
 
     var contentType: ContentType {
-        video.isNil ? (channel.isNil ? .playlist : .channel) : .video
+        video.isNil ? (channel.isNil ? (playlist.isNil ? .placeholder : .playlist) : .channel) : .video
     }
 }