Added some more logging around the plex user importer

fixed the discord notification issue #1513

src/Ombi.Api.Discord/DiscordApi.cs

@@ -20,7 +20,7 @@ namespace Ombi.Api.Discord
           
             request.AddJsonBody(body);
 
-            request.AddHeader("Content-Type", "application/json");
+            request.ApplicationJsonContentType();
 
             await Api.Request(request);
         }

src/Ombi.Schedule/Jobs/Plex/PlexUserImporter.cs

@@ -75,9 +75,10 @@ namespace Ombi.Schedule.Jobs.Plex
                             UserType = UserType.PlexUser,
                             UserName = plexUser.Username,
                             ProviderUserId = plexUser.Id,
-                            Email = plexUser.Email,
+                            Email = plexUser?.Email ?? string.Empty,
                             Alias = string.Empty
                         };
+                        _log.LogInformation("Creating Plex user {0}", newUser.UserName);
                         var result = await _userManager.CreateAsync(newUser);
                         if (!result.Succeeded)
                         {