Don't be so strict about dupe attr values.

src/NzbDrone.Common/Http/Dispatchers/IHttpDispatcher.cs

@@ -1,14 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.IO;
-using System.Linq;
 using System.Net;
-using NLog;
-using NzbDrone.Common.Cache;
-using NzbDrone.Common.EnvironmentInfo;
-using NzbDrone.Common.Extensions;
-using NzbDrone.Common.TPL;
 
 namespace NzbDrone.Common.Http.Dispatchers
 {

src/NzbDrone.Common/Http/HttpClient.cs

@@ -7,7 +7,6 @@ using System.Net;
 using NLog;
 using NzbDrone.Common.Cache;
 using NzbDrone.Common.EnvironmentInfo;
-using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Http.Dispatchers;
 using NzbDrone.Common.TPL;
 

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

@@ -126,7 +126,7 @@ namespace NzbDrone.Core.Indexers.Newznab
 
         protected string TryGetNewznabAttribute(XElement item, string key, string defaultValue = "")
         {
-            var attr = item.Elements(ns + "attr").SingleOrDefault(e => e.Attribute("name").Value.Equals(key, StringComparison.CurrentCultureIgnoreCase));
+            var attr = item.Elements(ns + "attr").FirstOrDefault(e => e.Attribute("name").Value.Equals(key, StringComparison.CurrentCultureIgnoreCase));
 
             if (attr != null)
             {

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

@@ -169,7 +169,7 @@ namespace NzbDrone.Core.Indexers.Torznab
 
         protected string TryGetTorznabAttribute(XElement item, string key, string defaultValue = "")
         {
-            var attr = item.Elements(ns + "attr").SingleOrDefault(e => e.Attribute("name").Value.Equals(key, StringComparison.CurrentCultureIgnoreCase));
+            var attr = item.Elements(ns + "attr").FirstOrDefault(e => e.Attribute("name").Value.Equals(key, StringComparison.CurrentCultureIgnoreCase));
 
             if (attr != null)
             {