Improve messaging for for Send Notifications setting in Emby / Jellyfin

(cherry picked from commit 4c0b8961741a7dd0cf2aba81cdbcb74c1208a1ff)

Closes #10251

src/NzbDrone.Core/Localization/Core/en.json

@@ -1076,8 +1076,8 @@
   "NotificationsEmailSettingsUseEncryption": "Use Encryption",
   "NotificationsEmailSettingsUseEncryptionHelpText": "Whether to prefer using encryption if configured on the server, to always use encryption via SSL (Port 465 only) or StartTLS (any other port) or to never use encryption",
   "NotificationsEmbySettingsSendNotifications": "Send Notifications",
-  "NotificationsEmbySettingsSendNotificationsHelpText": "Have MediaBrowser send notifications to configured providers",
-  "NotificationsEmbySettingsUpdateLibraryHelpText": "Update Library on Import, Rename, or Delete?",
+  "NotificationsEmbySettingsSendNotificationsHelpText": "Have Emby send notifications to configured providers. Not supported on Jellyfin.",
+  "NotificationsEmbySettingsUpdateLibraryHelpText": "Update Library on Import, Rename, or Delete",
   "NotificationsGotifySettingIncludeMoviePoster": "Include Movie Poster",
   "NotificationsGotifySettingIncludeMoviePosterHelpText": "Include movie poster in message",
   "NotificationsGotifySettingsAppToken": "App Token",

src/NzbDrone.Core/Notifications/MediaBrowser/MediaBrowserProxy.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net;
 using NLog;
 using NzbDrone.Common.Http;
 using NzbDrone.Common.Serializer;
@@ -24,6 +25,7 @@ namespace NzbDrone.Core.Notifications.Emby
             var path = "/Notifications/Admin";
             var request = BuildRequest(path, settings);
             request.Headers.ContentType = "application/json";
+            request.LogHttpError = false;
 
             request.SetContent(new
             {
@@ -32,7 +34,21 @@ namespace NzbDrone.Core.Notifications.Emby
                 ImageUrl = "https://raw.github.com/Radarr/Radarr/develop/Logo/64.png"
             }.ToJson());
 
-            ProcessRequest(request, settings);
+            try
+            {
+                ProcessRequest(request, settings);
+            }
+            catch (HttpException e)
+            {
+                if (e.Response.StatusCode == HttpStatusCode.NotFound)
+                {
+                    _logger.Warn("Unable to send notification to Emby. If you're using Jellyfin disable 'Send Notifications'");
+                }
+                else
+                {
+                    throw;
+                }
+            }
         }
 
         public HashSet<string> GetPaths(MediaBrowserSettings settings, Movie movie)

src/NzbDrone.Core/Notifications/MediaBrowser/MediaBrowserSettings.cs

@@ -25,6 +25,7 @@ namespace NzbDrone.Core.Notifications.Emby
         public MediaBrowserSettings()
         {
             Port = 8096;
+            UpdateLibrary = true;
         }
 
         [FieldDefinition(0, Label = "Host")]