From 7712f253c956c8cedd5ac400d257b342f934dfe2 Mon Sep 17 00:00:00 2001
From: artemp <artem@mapnik.org>
Date: Wed, 20 Jul 2016 12:39:55 +0200
Subject: [PATCH] represent value_null as an empty string e.g "" (text
 rendering logic)

---
 src/value.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/value.cpp b/src/value.cpp
index 7c6aca2be..b5ad606c7 100644
--- a/src/value.cpp
+++ b/src/value.cpp
@@ -673,7 +673,7 @@ struct convert<std::string>
 
     std::string operator()(value_null const&) const
     {
-        return std::string("null");
+        return std::string("");
     }
 };
 
@@ -708,7 +708,7 @@ struct to_unicode_impl
 
     value_unicode_string operator()(value_null const&) const
     {
-        return value_unicode_string("null");
+        return value_unicode_string("");
     }
 };