Don't store successful results for invalid providers

(cherry picked from commit de23182d593e2284972103d505e66dd8d812dfdb)

src/NzbDrone.Core/ThingiProvider/Status/ProviderStatusServiceBase.cs

@@ -59,6 +59,11 @@ namespace NzbDrone.Core.ThingiProvider.Status
 
         public virtual void RecordSuccess(int providerId)
         {
+            if (providerId <= 0)
+            {
+                return;
+            }
+
             lock (_syncRoot)
             {
                 var status = GetProviderStatus(providerId);