Fixed: Ignore file quality matching release quality for unknown quality releases

src/NzbDrone.Core.Test/MediaFiles/EpisodeImport/Specifications/GrabbedReleaseQualityFixture.cs

@@ -78,6 +78,20 @@ namespace NzbDrone.Core.Test.MediaFiles.EpisodeImport.Specifications
             Subject.IsSatisfiedBy(_localEpisode, _downloadClientItem).Accepted.Should().BeTrue();
         }
 
+        [Test]
+        public void should_be_accepted_if_grabbed_history_quality_is_unknown()
+        {
+            var history = Builder<History.History>.CreateListOfSize(1)
+                                                  .All()
+                                                  .With(h => h.EventType = HistoryEventType.Grabbed)
+                                                  .With(h => h.Quality = new QualityModel(Quality.Unknown))
+                                                  .BuildList();
+
+            GivenHistory(history);
+
+            Subject.IsSatisfiedBy(_localEpisode, _downloadClientItem).Accepted.Should().BeTrue();
+        }
+
         [Test]
         public void should_be_accepted_if_grabbed_history_quality_matches()
         {

src/NzbDrone.Core/MediaFiles/EpisodeImport/Specifications/GrabbedReleaseQualitySpecification.cs

@@ -5,6 +5,7 @@ using NzbDrone.Core.DecisionEngine;
 using NzbDrone.Core.Download;
 using NzbDrone.Core.History;
 using NzbDrone.Core.Parser.Model;
+using NzbDrone.Core.Qualities;
 
 namespace NzbDrone.Core.MediaFiles.EpisodeImport.Specifications
 {
@@ -46,7 +47,7 @@ namespace NzbDrone.Core.MediaFiles.EpisodeImport.Specifications
 
             foreach (var item in grabbedHistory)
             {
-                if (item.Quality != localEpisode.Quality)
+                if (item.Quality.Quality != Quality.Unknown && item.Quality != localEpisode.Quality)
                 {
                     _logger.Debug("Quality for grabbed release ({0}) does not match the quality of the file ({1})", item.Quality, localEpisode.Quality);
                     return Decision.Reject("File quality does not match quality of the grabbed release");