Fixed: Test messaging when indexer API returns an error with a message

src/NzbDrone.Core/Indexers/Newznab/NewznabException.cs

@@ -1,14 +1,16 @@
-using NzbDrone.Common.Exceptions;
+using NzbDrone.Core.Indexers.Exceptions;
 
 namespace NzbDrone.Core.Indexers.Newznab
 {
-    public class NewznabException : NzbDroneException
+    public class NewznabException : IndexerException
     {
-        public NewznabException(string message, params object[] args) : base(message, args)
+        public NewznabException(IndexerResponse response, string message, params object[] args)
+            : base(response, message, args)
         {
         }
 
-        public NewznabException(string message) : base(message)
+        public NewznabException(IndexerResponse response, string message)
+            : base(response, message)
         {
         }
     }

src/NzbDrone.Core/Indexers/Newznab/NewznabRssParser.cs

@@ -37,7 +37,7 @@ namespace NzbDrone.Core.Indexers.Newznab
                 throw new RequestLimitReachedException("API limit reached");
             }
 
-            throw new NewznabException("Newznab error detected: {0}", errorMessage);
+            throw new NewznabException(indexerResponse, errorMessage);
         }
 
         protected override ReleaseInfo ProcessItem(XElement item, ReleaseInfo releaseInfo)