skip queue check and adding new items if download client isn't configured correctly.

NzbDrone.Core/Download/Clients/BlackholeProvider.cs

@@ -63,6 +63,14 @@ namespace NzbDrone.Core.Download.Clients
             }
         }
 
+        public bool IsConfigured
+        {
+            get
+            {
+                return !string.IsNullOrWhiteSpace(_configService.BlackholeFolder);
+            }
+        }
+
         public IEnumerable<QueueItem> GetQueue()
         {
             return new QueueItem[0];

NzbDrone.Core/Download/Clients/Nzbget/NzbgetClient.cs

@@ -57,6 +57,14 @@ namespace NzbDrone.Core.Download.Clients.Nzbget
             return false;
         }
 
+        public bool IsConfigured
+        {
+            get
+            {
+                return !string.IsNullOrWhiteSpace(_configService.NzbgetHost) && _configService.NzbgetPort != 0;
+            }
+        }
+
         public virtual IEnumerable<QueueItem> GetQueue()
         {
             var command = new JsonRequest

NzbDrone.Core/Download/Clients/PneumaticClient.cs

@@ -68,6 +68,14 @@ namespace NzbDrone.Core.Download.Clients
             }
         }
 
+        public bool IsConfigured
+        {
+            get
+            {
+                return !string.IsNullOrWhiteSpace(_configService.PneumaticFolder);
+            }
+        }
+
         public IEnumerable<QueueItem> GetQueue()
         {
             return new QueueItem[0];

NzbDrone.Core/Download/Clients/Sabnzbd/SabnzbdClient.cs

@@ -24,7 +24,7 @@ namespace NzbDrone.Core.Download.Clients.Sabnzbd
         public IRestRequest AddToQueueRequest(RemoteEpisode remoteEpisode)
         {
             string cat = _configService.SabTvCategory;
-            int priority =  (int)_configService.SabRecentTvPriority;
+            int priority = (int)_configService.SabRecentTvPriority;
 
             string name = remoteEpisode.Report.NzbUrl.Replace("&", "%26");
             string nzbName = HttpUtility.UrlEncode(remoteEpisode.Report.Title);
@@ -97,6 +97,15 @@ namespace NzbDrone.Core.Download.Clients.Sabnzbd
             return false;
         }
 
+        public bool IsConfigured
+        {
+            get
+            {
+                return !string.IsNullOrWhiteSpace(_configService.SabHost)
+                    && _configService.SabPort != 0;
+            }
+        }
+
         public IEnumerable<QueueItem> GetQueue()
         {
             string action = String.Format("mode=queue&output=json&start={0}&limit={1}", 0, 0);