Fixed: Ensure Quality is always initialised in AudioTag.Read (#694)

* Fixed: Ensure Quality is always initialised in AudioTag.Read

* Fixed: Log quality message on fallback quality detection

src/NzbDrone.Core/MediaFiles/AudioTag.cs

@@ -200,16 +200,20 @@ namespace NzbDrone.Core.MediaFiles
                     // Log as error so it goes to sentry with correct fingerprint
                     Logger.Error(ex, "Tag reading failed for {0}", path);
                 }
-
-                // make sure these are initialized to avoid errors later on
-                Quality = QualityParser.ParseQuality(path, null, EstimateBitrate(file, path));
-                Logger.Debug($"Quality parsed: {Quality}, Source: {Quality.QualityDetectionSource}");
-                MediaInfo = new MediaInfoModel();
             }
             finally
             {
                 file?.Dispose();
             }
+
+            // make sure these are initialized to avoid errors later on
+            if (Quality == null)
+            {
+                Quality = QualityParser.ParseQuality(path, null, EstimateBitrate(file, path));
+                Logger.Debug($"Unable to parse qulity from tag, Quality parsed from file path: {Quality}, Source: {Quality.QualityDetectionSource}");
+            }
+
+            MediaInfo = MediaInfo ?? new MediaInfoModel();
         }
 
         private int EstimateBitrate(TagLib.File file, string path)