Application will automatically restart on db error.

Added SyncProvider Tests

NzbDrone.Core.Test/NzbDrone.Core.Test.csproj

@@ -93,6 +93,7 @@
     <Compile Include="AutoMoq\Unity\AutoMockingContainerExtension.cs">
       <SubType>Code</SubType>
     </Compile>
+    <Compile Include="SyncProviderTest.cs" />
     <Compile Include="RootDirProviderTest.cs" />
     <Compile Include="RssProviderTest.cs" />
     <Compile Include="HistoryProviderTest.cs" />

NzbDrone.Core.Test/SyncProviderTest.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using AutoMoq;
+using Gallio.Framework;
+using MbUnit.Framework;
+using MbUnit.Framework.ContractVerifiers;
+using Moq;
+using NzbDrone.Core.Providers;
+using NzbDrone.Core.Providers.Core;
+using SubSonic.Repository;
+
+namespace NzbDrone.Core.Test
+{
+    [TestFixture]
+    // ReSharper disable InconsistentNaming
+    public class SyncProviderTest
+    {
+        [Test]
+        public void None_existing_folder_returns_empty_list()
+        {
+            string path = "d:\\bad folder";
+
+            var mocker = new AutoMoqer();
+            mocker.GetMock<DiskProvider>(MockBehavior.Strict)
+                .Setup(m => m.FolderExists(path)).Returns(false);
+
+            var result = mocker.Resolve<SyncProvider>().GetUnmappedFolders(path);
+
+            Assert.IsNotNull(result);
+            Assert.IsEmpty(result);
+
+            mocker.VerifyAllMocks();
+        }
+
+        [Test]
+        [ExpectedException(typeof(ArgumentException))]
+        public void empty_folder_path_throws()
+        {
+            var mocker = new AutoMoqer();
+            mocker.Resolve<SyncProvider>().GetUnmappedFolders("");
+        }
+    }
+}

NzbDrone.Core/Providers/MediaFileProvider.cs

@@ -30,6 +30,11 @@ public MediaFileProvider(IRepository repository, ConfigProvider configProvider,
             _episodeProvider = episodeProvider;
         }
 
+        public MediaFileProvider()
+        {
+
+        }
+
         /// <summary>
         /// Scans the specified series folder for media files
         /// </summary>

NzbDrone.Core/Providers/SyncProvider.cs

@@ -41,15 +41,17 @@ public List<String> GetUnmappedFolders(string path)
         {
             Logger.Debug("Generating list of unmapped folders");
             if (String.IsNullOrEmpty(path))
-                throw new InvalidOperationException("Invalid path provided");
+                throw new ArgumentException("Invalid path provided", "path");
+
+            var results = new List<String>();
 
             if (!_diskProvider.FolderExists(path))
             {
                 Logger.Debug("Path supplied does not exist: {0}", path);
-                return null;
+                return results;
             }
 
-            var results = new List<String>();
+
             foreach (string seriesFolder in _diskProvider.GetDirectories(path))
             {
                 var cleanPath = Parser.NormalizePath(new DirectoryInfo(seriesFolder).FullName);

NzbDrone.Web/Global.asax.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Data.SQLite;
 using System.Diagnostics;
 using System.Reflection;
 using System.Threading;
@@ -74,11 +75,17 @@ protected void Application_Error(object sender, EventArgs e)
                 {
                     Response.Redirect(Request.ApplicationPath);
                 }
+                return;
             }
-            else
+
+            Logger.FatalException(lastError.Message, lastError);
+
+            if (lastError is SQLiteException)
             {
-                Logger.FatalException(lastError.Message, lastError);
+                Logger.Warn("Restarting application");
+                HttpRuntime.UnloadAppDomain();
             }
+
         }
 
         protected void Application_BeginRequest()