Fixed: Manual import when quality was not available after failed parsing

Closes #911

src/NzbDrone.Api/ManualImport/ManualImportModule.cs

@@ -29,10 +29,13 @@ namespace NzbDrone.Api.ManualImport
         }
 
         private ManualImportResource AddQualityWeight(ManualImportResource item)
+        {
+            if (item.Quality != null)
             {
                 item.QualityWeight = Quality.DefaultQualityDefinitions.Single(q => q.Quality == item.Quality.Quality).Weight;
                 item.QualityWeight += item.Quality.Revision.Real * 10;
                 item.QualityWeight += item.Quality.Revision.Version;
+            }
            
             return item;
         }

src/NzbDrone.Core.Test/ParserTests/MultiEpisodeParserFixture.cs

@@ -42,6 +42,7 @@ namespace NzbDrone.Core.Test.ParserTests
         //[TestCase("Adventure Time - 5x01 - x02 - Finn the Human (2) & Jake the Dog (3)", "Adventure Time", 5, new [] { 1, 2 })]
         [TestCase("The Young And The Restless - S42 Ep10718 - Ep10722", "The Young And The Restless", 42, new[] { 10718, 10719, 10720, 10721, 10722 })]
         [TestCase("The Young And The Restless - S42 Ep10688 - Ep10692", "The Young And The Restless", 42, new[] { 10688, 10689, 10690, 10691, 10692 })]
+        [TestCase("RWBY.S01E02E03.1080p.BluRay.x264-DeBTViD", "RWBY", 1, new [] { 2, 3 })]
         //[TestCase("", "", , new [] {  })]
         public void should_parse_multiple_episodes(string postTitle, string title, int season, int[] episodes)
         {