Fixed: Health check failing and preventing others from running

src/NzbDrone.Core/HealthCheck/Checks/ImportMechanismCheck.cs

@@ -1,7 +1,10 @@
-using System.Linq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
 using NzbDrone.Common.Disk;
 using NzbDrone.Core.Configuration;
 using NzbDrone.Core.Download;
+using NzbDrone.Core.Download.Clients;
 using NzbDrone.Core.Download.Clients.Nzbget;
 using NzbDrone.Core.Download.Clients.Sabnzbd;
 
@@ -22,11 +25,26 @@ namespace NzbDrone.Core.HealthCheck.Checks
         public override HealthCheck Check()
         {
             var droneFactoryFolder = new OsPath(_configService.DownloadedEpisodesFolder);
-            var downloadClients = _provideDownloadClient.GetDownloadClients().Select(v => new { downloadClient = v, status = v.GetStatus() }).ToList();
+            List<ImportMechanismCheckStatus> downloadClients;
 
-            var downloadClientIsLocalHost = downloadClients.All(v => v.status.IsLocalhost);
-            var downloadClientOutputInDroneFactory = !droneFactoryFolder.IsEmpty
-                && downloadClients.Any(v => v.status.OutputRootFolders != null && v.status.OutputRootFolders.Any(droneFactoryFolder.Contains));
+            try
+            {
+                downloadClients = _provideDownloadClient.GetDownloadClients().Select(v => new ImportMechanismCheckStatus
+                {
+                    DownloadClient = v,
+                    Status = v.GetStatus()
+                }).ToList();
+            }
+            catch (DownloadClientException)
+            {
+                // One or more download clients failed, assume the health is okay and verify later
+                return new HealthCheck(GetType());
+            }
+
+            var downloadClientIsLocalHost = downloadClients.All(v => v.Status.IsLocalhost);
+            var downloadClientOutputInDroneFactory = !droneFactoryFolder.IsEmpty &&
+                                                     downloadClients.Any(v => v.Status.OutputRootFolders != null &&
+                                                     v.Status.OutputRootFolders.Any(droneFactoryFolder.Contains));
 
             if (!_configService.IsDefined("EnableCompletedDownloadHandling"))
             {
@@ -36,7 +54,7 @@ namespace NzbDrone.Core.HealthCheck.Checks
                     return new HealthCheck(GetType(), HealthCheckResult.Warning, "Enable Completed Download Handling if possible (Multi-Computer unsupported)", "Migrating-to-Completed-Download-Handling#Unsupported-download-client-on-different-computer");
                 }
 
-                if (downloadClients.All(v => v.downloadClient is Sabnzbd))
+                if (downloadClients.All(v => v.DownloadClient is Sabnzbd))
                 {
                     // With Sabnzbd we can check if the category should be changed.
                     if (downloadClientOutputInDroneFactory)
@@ -46,7 +64,8 @@ namespace NzbDrone.Core.HealthCheck.Checks
 
                     return new HealthCheck(GetType(), HealthCheckResult.Warning, "Enable Completed Download Handling if possible (Sabnzbd)", "Migrating-to-Completed-Download-Handling#sabnzbd-enable-completed-download-handling");
                 }
-                if (downloadClients.All(v => v.downloadClient is Nzbget))
+
+                if (downloadClients.All(v => v.DownloadClient is Nzbget))
                 {
                     // With Nzbget we can check if the category should be changed.
                     if (downloadClientOutputInDroneFactory)
@@ -56,6 +75,7 @@ namespace NzbDrone.Core.HealthCheck.Checks
 
                     return new HealthCheck(GetType(), HealthCheckResult.Warning, "Enable Completed Download Handling if possible (Nzbget)", "Migrating-to-Completed-Download-Handling#nzbget-enable-completed-download-handling");
                 }
+
                 return new HealthCheck(GetType(), HealthCheckResult.Warning, "Enable Completed Download Handling if possible", "Migrating-to-Completed-Download-Handling");
             }
 
@@ -64,8 +84,13 @@ namespace NzbDrone.Core.HealthCheck.Checks
                 return new HealthCheck(GetType(), HealthCheckResult.Warning, "Enable Completed Download Handling or configure Drone factory");
             }
 
-
             return new HealthCheck(GetType());
         }
     }
+
+    public class ImportMechanismCheckStatus
+    {
+        public IDownloadClient DownloadClient { get; set; }
+        public DownloadClientStatus Status { get; set; }
+    }
 }