Fixed: Ensure indexer errors are handled before processing response

(cherry picked from commit 76f93c8415419f0c3dab90582d47a1c9a653263c)

src/NzbDrone.Core/Indexers/EzrssTorrentRssParser.cs

@@ -1,6 +1,4 @@
-using System.Linq;
-using System.Xml.Linq;
-using NzbDrone.Common.Extensions;
+using System.Linq;
 using NzbDrone.Core.Indexers.Exceptions;
 
 namespace NzbDrone.Core.Indexers
@@ -20,6 +18,8 @@ namespace NzbDrone.Core.Indexers
 
         protected override bool PreProcess(IndexerResponse indexerResponse)
         {
+            base.PreProcess(indexerResponse);
+
             var document = LoadXmlDocument(indexerResponse);
             var items = GetItems(document).ToList();
 
@@ -28,7 +28,7 @@ namespace NzbDrone.Core.Indexers
                 throw new IndexerException(indexerResponse, "No results were found");
             }
 
-            return base.PreProcess(indexerResponse);
+            return true;
         }
     }
 }

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

@@ -56,6 +56,11 @@ namespace NzbDrone.Core.Indexers.Newznab
 
         protected override bool PreProcess(IndexerResponse indexerResponse)
         {
+            if (indexerResponse.HttpResponse.HasHttpError)
+            {
+                base.PreProcess(indexerResponse);
+            }
+
             var xdoc = LoadXmlDocument(indexerResponse);
 
             CheckError(xdoc, indexerResponse);

src/NzbDrone.Core/Indexers/Torznab/TorznabRssParser.cs

@@ -21,6 +21,11 @@ namespace NzbDrone.Core.Indexers.Torznab
 
         protected override bool PreProcess(IndexerResponse indexerResponse)
         {
+            if (indexerResponse.HttpResponse.HasHttpError)
+            {
+                base.PreProcess(indexerResponse);
+            }
+
             var xdoc = LoadXmlDocument(indexerResponse);
             var error = xdoc.Descendants("error").FirstOrDefault();