Remove empty constructors

Closes #2474

src/NzbDrone.Core/Download/DownloadsProcessedEvent.cs

@@ -1,11 +1,8 @@
-using NzbDrone.Common.Messaging;
+using NzbDrone.Common.Messaging;
 
 namespace NzbDrone.Core.Download
 {
     public class DownloadsProcessedEvent : IEvent
     {
-        public DownloadsProcessedEvent()
-        {
-        }
     }
 }

src/NzbDrone.Core/MetadataSource/Goodreads/Resources/ListResource.cs

@@ -11,10 +11,6 @@ namespace NzbDrone.Core.MetadataSource.Goodreads
     [DebuggerDisplay("{DebuggerDisplay,nq}")]
     public sealed class ListResource : GoodreadsResource
     {
-        public ListResource()
-        {
-        }
-
         public override string ElementName => "list";
 
         public int Page { get; private set; }

src/NzbDrone.Core/Notifications/Goodreads/OwnedBooks/GoodreadsOwnedBooksNotificationSettings.cs

@@ -17,10 +17,6 @@ namespace NzbDrone.Core.Notifications.Goodreads
     {
         private static readonly GoodreadsSettingsBaseValidator<GoodreadsOwnedBooksNotificationSettings> Validator = new GoodreadsSettingsBaseValidator<GoodreadsOwnedBooksNotificationSettings>();
 
-        public GoodreadsOwnedBooksNotificationSettings()
-        {
-        }
-
         [FieldDefinition(1, Label = "Condition", Type = FieldType.Select, SelectOptions = typeof(OwnedBookCondition))]
         public int Condition { get; set; } = (int)OwnedBookCondition.BrandNew;
 

src/NzbDrone.Core/Notifications/Synology/SynologyIndexerSettings.cs

@@ -1,4 +1,4 @@
-using FluentValidation;
+using FluentValidation;
 using NzbDrone.Core.Annotations;
 using NzbDrone.Core.ThingiProvider;
 using NzbDrone.Core.Validation;
@@ -7,9 +7,6 @@ namespace NzbDrone.Core.Notifications.Synology
 {
     public class SynologyIndexerSettingsValidator : AbstractValidator<SynologyIndexerSettings>
     {
-        public SynologyIndexerSettingsValidator()
-        {
-        }
     }
 
     public class SynologyIndexerSettings : IProviderConfig

src/Readarr.Http/ApiInfoController.cs

@@ -5,10 +5,6 @@ namespace Readarr.Http
 {
     public class ApiInfoController : Controller
     {
-        public ApiInfoController()
-        {
-        }
-
         [HttpGet("/api")]
         [Produces("application/json")]
         public ApiInfoResource GetApiInfo()