fix: Exception when either Sonarr or Radarr configs are empty

CHANGELOG.md

@@ -12,6 +12,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Environment variables may now be used in YAML configuration (#145).
 
+### Fixed
+
+- Exception when there's not configuration for both Sonarr and Radarr together.
+
 ## [4.2.0] - 2023-01-13
 
 ### Added

src/Recyclarr.TrashLib.Tests/Config/Parsing/ConfigRegistryTest.cs

@@ -0,0 +1,42 @@
+using FluentAssertions;
+using NUnit.Framework;
+using Recyclarr.TrashLib.Config;
+using Recyclarr.TrashLib.Config.Parsing;
+using Recyclarr.TrashLib.Services.Radarr.Config;
+using Recyclarr.TrashLib.Services.Sonarr.Config;
+
+namespace Recyclarr.TrashLib.Tests.Config.Parsing;
+
+[TestFixture]
+[Parallelizable(ParallelScope.All)]
+public class ConfigRegistryTest
+{
+    [Test]
+    public void Get_configs_by_type()
+    {
+        var configs = new[]
+        {
+            new SonarrConfiguration {InstanceName = "one"},
+            new SonarrConfiguration {InstanceName = "two"}
+        };
+
+        var sut = new ConfigRegistry();
+        sut.Add(SupportedServices.Sonarr, configs[0]);
+        sut.Add(SupportedServices.Sonarr, configs[1]);
+
+        var result = sut.GetConfigsOfType<SonarrConfiguration>(SupportedServices.Sonarr);
+
+        result.Should().Equal(configs);
+    }
+
+    [Test]
+    public void Get_empty_collection_when_no_configs_of_type()
+    {
+        var sut = new ConfigRegistry();
+        sut.Add(SupportedServices.Sonarr, new SonarrConfiguration());
+
+        var result = sut.GetConfigsOfType<RadarrConfiguration>(SupportedServices.Radarr);
+
+        result.Should().BeEmpty();
+    }
+}

src/Recyclarr.TrashLib/Config/Parsing/ConfigRegistry.cs

@@ -14,7 +14,12 @@ public class ConfigRegistry : IConfigRegistry
 
     public IReadOnlyCollection<T> GetConfigsOfType<T>(SupportedServices serviceType) where T : ServiceConfiguration
     {
-        return _configs[serviceType].Cast<T>().ToList();
+        if (_configs.TryGetValue(serviceType, out var configs))
+        {
+            return configs.Cast<T>().ToList();
+        }
+
+        return Array.Empty<T>();
     }
 
     public bool DoesConfigExist(string name)