Handle partial creation of DisposableAction (fixes #29) (#30)

* Handle partial creation

Docs/releases.md

@@ -5,6 +5,7 @@
  * Ensured add/remove on events are thread safe ([#23](https://github.com/mrpmorris/Fluxor/issues/23))
  * Made it easier to find the source of DisposableCallback instances that are not disposed ([#24](https://github.com/mrpmorris/Fluxor/issues/24))
  * State properties were not discovered if they were declared as private in a base class ([#25](https://github.com/mrpmorris/Fluxor/issues/25))
+ * Handle disposing of partially created DisposableAction ([#29](https://github.com/mrpmorris/Fluxor/issues/29))
 
 ### New in 3.1.0
   * Used Newtonsoft entirely for JS interop to ReduxDevTools to prevent serialization errors ([#7](https://github.com/mrpmorris/Fluxor/issues/7))

Source/Fluxor/DisposableCallback.cs

@@ -12,6 +12,7 @@ public sealed class DisposableCallback : IDisposable
 		private readonly string Id;
 		private readonly Action Action;
 		private bool IsDisposed;
+		private bool WasCreated;
 
 		/// <summary>
 		/// Creates an instance of the class
@@ -30,6 +31,7 @@ public DisposableCallback(string id, Action action)
 
 			Id = id;
 			Action = action;
+			WasCreated = true;
 		}
 
 		/// <summary>
@@ -53,7 +55,7 @@ public void Dispose()
 		/// <exception cref="InvalidOperationException">Thrown if the object is collected without being disposed</exception>
 		~DisposableCallback()
 		{
-			if (!IsDisposed)
+			if (!IsDisposed && WasCreated)
 				throw new InvalidOperationException($"{nameof(DisposableCallback)} with Id \"{Id}\" was not disposed.");
 		}
 	}