Exception thrown from Opening event handler causes hung state

If an exception is thrown from the ICommunicationObject.Faulted event handler, execution becomes hung. It works fine on the old .NET Framework WCF.

**Steps to Reproduce**
1. Create a WCF client (I used dotnet-svcutil on a SOAP service)
2. Instantiate the client
3. Call `client.Opening += (sender, args) => throw new Exception("Triggering Faulted state")`
4. Execute a method on the client

**Expected Result**
- An exception is thrown and `client.State` becomes `CommunicationState.Faulted`

**Actual Result**
- Execution hangs