Fixed: Release Push api broken when no indexer id is specified

src/NzbDrone.Core/DecisionEngine/Specifications/RssSync/IndexerTagSpecification.cs

@@ -1,6 +1,7 @@
 using System.Linq;
 using NLog;
 using NzbDrone.Common.Extensions;
+using NzbDrone.Core.Datastore;
 using NzbDrone.Core.Indexers;
 using NzbDrone.Core.IndexerSearch.Definitions;
 using NzbDrone.Core.Parser.Model;
@@ -10,12 +11,12 @@ namespace NzbDrone.Core.DecisionEngine.Specifications.RssSync
     public class IndexerTagSpecification : IDecisionEngineSpecification
     {
         private readonly Logger _logger;
-        private readonly IIndexerRepository _indexerRepository;
+        private readonly IIndexerFactory _indexerFactory;
 
-        public IndexerTagSpecification(Logger logger, IIndexerRepository indexerRepository)
+        public IndexerTagSpecification(Logger logger, IIndexerFactory indexerFactory)
         {
             _logger = logger;
-            _indexerRepository = indexerRepository;
+            _indexerFactory = indexerFactory;
         }
 
         public SpecificationPriority Priority => SpecificationPriority.Default;
@@ -23,8 +24,24 @@ namespace NzbDrone.Core.DecisionEngine.Specifications.RssSync
 
         public virtual Decision IsSatisfiedBy(RemoteEpisode subject, SearchCriteriaBase searchCriteria)
         {
+            if (subject.Release == null || subject.Series?.Tags == null || subject.Release.IndexerId == 0)
+            {
+                return Decision.Accept();
+            }
+
+            IndexerDefinition indexer;
+            try
+            {
+                indexer = _indexerFactory.Get(subject.Release.IndexerId);
+            }
+            catch (ModelNotFoundException)
+            {
+                _logger.Debug("Indexer with id {0} does not exist, skipping indexer tags check", subject.Release.IndexerId);
+                return Decision.Accept();
+            }
+
             // If indexer has tags, check that at least one of them is present on the series
-            var indexerTags = _indexerRepository.Get(subject.Release.IndexerId).Tags;
+            var indexerTags = indexer.Tags;
 
             if (indexerTags.Any() && indexerTags.Intersect(subject.Series.Tags).Empty())
             {