Add try/catch around _browserProcessServiceHost->Open call - seems that occasionally there's a timing issue

See #862, #804 and #1494

Author: amaitland

CefSharp.Core/ManagedCefBrowserAdapter.cpp

@@ -55,10 +55,16 @@ void ManagedCefBrowserAdapter::OnAfterBrowserCreated(int browserId)
             _browserProcessServiceHost = gcnew BrowserProcessServiceHost(_javaScriptObjectRepository, Process::GetCurrentProcess()->Id, this);
             //NOTE: Attempt to solve timing issue where browser is opened and rapidly disposed. In some cases a call to Open throws
             // an exception about the process already being closed. Two relevant issues are #862 and #804.
-            // Considering adding an IsDisposed check and also may have to revert to a try catch block
             if (_browserProcessServiceHost->State == CommunicationState::Created)
             {
-                _browserProcessServiceHost->Open();
+                try
+                {
+                    _browserProcessServiceHost->Open();
+                }
+                catch (Exception^)
+                {
+                    //Ignore exception as it's likely cause when the browser is closing
+                }
             }
         }