Removed dangerous default value from jsd_string.

Author: 5cript

parse/jsd_string.cpp

@@ -7,15 +7,15 @@ void parse(std::string& value, std::string const& name,
 {
     try
     {
-        GET_VALUE(std::string, name, value, "<undefined>");
+        GET_VALUE(std::string, name, value, "");
     }
     catch (boost::property_tree::ptree_bad_data& exc)
     {
-        DEFAULT_PROPERTY_ERROR_HANDLER("", "<undefined>");
+        DEFAULT_PROPERTY_ERROR_HANDLER("", "");
     }
     catch (boost::property_tree::ptree_bad_path& exc)
     {
-        DEFAULT_PATH_ERROR_HANDLER("", "<undefined>");
+        DEFAULT_PATH_ERROR_HANDLER("", "");
     }
 }