Fixed: Prevent error on manual import processing with multi languages

Closes #7713

src/NzbDrone.Core/MediaFiles/MovieImport/Manual/ManualImportService.cs

@@ -121,8 +121,8 @@ namespace NzbDrone.Core.MediaFiles.MovieImport.Manual
                 SceneSource = SceneSource(movie, rootFolder),
                 ExistingFile = movie.Path.IsParentPath(path),
                 Size = _diskProvider.GetFileSize(path),
-                Languages = (languages?.SingleOrDefault() ?? Language.Unknown) == Language.Unknown ? languageParse : languages,
-                Quality = quality.Quality == Quality.Unknown ? QualityParser.ParseQuality(path) : quality,
+                Languages = languages?.Count <= 1 && (languages?.SingleOrDefault() ?? Language.Unknown) == Language.Unknown ? languageParse : languages,
+                Quality = (quality?.Quality ?? Quality.Unknown) == Quality.Unknown ? QualityParser.ParseQuality(path) : quality,
                 ReleaseGroup = releaseGroup.IsNullOrWhiteSpace() ? Parser.Parser.ParseReleaseGroup(path) : releaseGroup,
             };
 

src/Radarr.Api.V3/ManualImport/ManualImportController.cs

@@ -35,7 +35,9 @@ namespace Radarr.Api.V3.ManualImport
 
                 item.Movie = processedItem.Movie.ToResource(0);
                 item.Rejections = processedItem.Rejections;
-                if (item.Languages.Single() == Language.Unknown)
+
+                if (item.Languages?.Count <= 1 && (item.Languages?.SingleOrDefault() ?? Language.Unknown) == Language.Unknown &&
+                    processedItem.Languages.Any())
                 {
                     item.Languages = processedItem.Languages;
                 }
@@ -45,7 +47,7 @@ namespace Radarr.Api.V3.ManualImport
                     item.Quality = processedItem.Quality;
                 }
 
-                if (item.ReleaseGroup.IsNotNullOrWhiteSpace())
+                if (item.ReleaseGroup.IsNullOrWhiteSpace())
                 {
                     item.ReleaseGroup = processedItem.ReleaseGroup;
                 }