fix for not implemented exception in moddb downloader

Wabbajack.Test/DownloaderTests.cs

@@ -14,6 +14,12 @@ namespace Wabbajack.Test
     [TestClass]
     public class DownloaderTests
     {
+        [TestMethod]
+        public void TestAllPrepares()
+        {
+            DownloadDispatcher.Downloaders.Do(d => d.Prepare());
+        }
+
         [TestMethod]
         public void MegaDownload()
         {

Wabbajack/Downloaders/DownloadDispatcher.cs

@@ -9,7 +9,7 @@ namespace Wabbajack.Downloaders
 {
     public static class DownloadDispatcher
     {
-        private static readonly List<IDownloader> Downloaders = new List<IDownloader>()
+        public static readonly List<IDownloader> Downloaders = new List<IDownloader>()
         {
             new MegaDownloader(),
             new DropboxDownloader(),

Wabbajack/Downloaders/ModDBDownloader.cs

@@ -29,7 +29,6 @@ namespace Wabbajack.Downloaders
 
         public void Prepare()
         {
-            throw new NotImplementedException();
         }
 
         public class State : AbstractDownloadState

Wabbajack/NexusApi/NexusApi.cs

@@ -141,7 +141,7 @@ namespace Wabbajack.NexusApi
                 dailyRemaining = int.Parse(response.Headers.GetValues("x-rl-daily-remaining").First());
                 hourlyRemaining = int.Parse(response.Headers.GetValues("x-rl-hourly-remaining").First());
             }
-            catch (InvalidDataException ex)
+            catch (InvalidDataException)
             {
                 Utils.Log("Couldn't find x-rl-*-remaining headers in Nexus response. Ignoring");
                 return;