Bug fix:

- DataTreeCore:
  - Error in GetChild() return when Child not created

DataTreeCore.cpp

@@ -267,7 +267,7 @@ CDataMember *  CDataMember::GetChild( const char * Path, bool Create )
         // Next level
         Member  = *Child;
     }
-    return *Child;
+    return (Child)? *Child : NULL;
 }
 //---------------------------------------------------------------------------