Fixed: Prevent exception when grabbing unparsable release

Closes #7494

src/NzbDrone.Core/DataAugmentation/Scene/SceneMappingService.cs

@@ -94,6 +94,11 @@ namespace NzbDrone.Core.DataAugmentation.Scene
 
         public SceneMapping FindSceneMapping(string seriesTitle, string releaseTitle, int sceneSeasonNumber)
         {
+            if (seriesTitle.IsNullOrWhiteSpace())
+            {
+                return null;
+            }
+
             var mappings = FindMappings(seriesTitle, releaseTitle);
 
             if (mappings == null)

src/NzbDrone.Core/Parser/Parser.cs

@@ -836,6 +836,11 @@ namespace NzbDrone.Core.Parser
 
         public static string CleanSeriesTitle(this string title)
         {
+            if (title.IsNullOrWhiteSpace())
+            {
+                return title;
+            }
+
             // If Title only contains numbers return it as is.
             if (long.TryParse(title, out _))
             {

src/Sonarr.Api.V3/Indexers/ReleaseController.cs

@@ -127,7 +127,7 @@ namespace Sonarr.Api.V3.Indexers
 
                         if (episodes.Empty())
                         {
-                            throw new NzbDroneClientException(HttpStatusCode.NotFound, "Unable to parse episodes in the release");
+                            throw new NzbDroneClientException(HttpStatusCode.NotFound, "Unable to parse episodes in the release, will need to be manually provided");
                         }
 
                         remoteEpisode.Series = series;
@@ -135,7 +135,7 @@ namespace Sonarr.Api.V3.Indexers
                     }
                     else
                     {
-                        throw new NzbDroneClientException(HttpStatusCode.NotFound, "Unable to find matching series and episodes");
+                        throw new NzbDroneClientException(HttpStatusCode.NotFound, "Unable to find matching series and episodes, will need to be manually provided");
                     }
                 }
                 else if (remoteEpisode.Episodes.Empty())
@@ -154,7 +154,7 @@ namespace Sonarr.Api.V3.Indexers
 
                 if (remoteEpisode.Episodes.Empty())
                 {
-                    throw new NzbDroneClientException(HttpStatusCode.NotFound, "Unable to parse episodes in the release");
+                    throw new NzbDroneClientException(HttpStatusCode.NotFound, "Unable to parse episodes in the release, will need to be manually provided");
                 }
 
                 await _downloadService.DownloadReport(remoteEpisode, release.DownloadClientId);