refs #310, used empty network context with runtime/context base classes

* refactored to member initialization
* adjusted asserts
* adjusted isXXObject methods
* changed create method for ContextNetwork to support empty context
* empty status message used as return value in empty context

src/blackcore/context.cpp

@@ -1,6 +1,16 @@
+/* Copyright (C) 2013
+ * swift Project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
 #include "context.h"
 #include <QDebug>
 
+using namespace BlackMisc;
+
 namespace BlackCore
 {
 
@@ -63,4 +73,10 @@ namespace BlackCore
     {
         return this->getRuntime()->getIContextSimulator();
     }
-}
+
+    const CStatusMessage &CContext::statusMessageEmptyContext()
+    {
+        static const CStatusMessage m("swift.context.emptycontext", CStatusMessage::SeverityWarning, "empty context");
+        return m;
+    }
+} // namespace