Merge pull request #1154 from ricado-group/1153-semaphore-disposed-exception

Fix for #1153 - Semaphore disposed before discarded tasks have finished

(cherry picked from commit 0c95330)

Author: michaelklishin

projects/RabbitMQ.Client/client/impl/AsyncConsumerWorkService.cs

@@ -178,7 +178,14 @@ private static async Task HandleConcurrent(Work work, IModel model, SemaphoreSli
                 finally
                 {
                     work.PostExecute();
-                    limiter.Release();
+
+                    try
+                    {
+                        limiter.Release();
+                    }
+                    catch (ObjectDisposedException) // Prevents Exceptions in the Task's finalizer when the WorkPool is Stopped
+                    {
+                    }
                 }
             }