[vala/wip/transform: 87/97] Fix string templates

[Rico Tzschichholz <ricotz src gnome org>]

commit 9a152611a95040abc85b7de3be618793a52093ff
Author: Luca Bruno <luca bruno immobiliare it>
Date:   Mon Jul 7 09:57:08 2014 +0200

    Fix string templates

 vala/valacodetransformer.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/vala/valacodetransformer.vala b/vala/valacodetransformer.vala
index c2c84a5d1..70b9aa17b 100644
--- a/vala/valacodetransformer.vala
+++ b/vala/valacodetransformer.vala
@@ -295,7 +295,7 @@ public class Vala.CodeTransformer : CodeVisitor {
        }
 
        public Expression stringify (Expression expr) {
-               if (expr.value_type.data_type != null && expr.value_type.data_type.is_subtype_of 
(context.analyzer.string_type.data_type)) {
+               if (expr.value_type != null && expr.value_type.data_type != null && 
expr.value_type.data_type.is_subtype_of (context.analyzer.string_type.data_type)) {
                        return expr;
                } else {
                        return expression (@"%?.to_string ()", {expr});