[seed] Fixing _to_boolean conversion in seed

[Danilo Cesar Lemes de Paula <danilocesar src gnome org>]

commit 3681229231fc00cc6fed442a3c2a357bb1088e7b
Author: Danilo Cesar Lemes de Paula <danilo cesar collabora co uk>
Date:   Wed Aug 24 14:54:33 2016 -0300

    Fixing _to_boolean conversion in seed
    
    According to ECMA 262 3th edition SPEC [1], _to_boolean should return:
    FALSE when the argument is NULL OR Undefined.
    
    This fix should cover that and get ride of some warnings/exceptions.
    
    [1] 
http://www.ecma-international.org/publications/files/ECMA-ST-ARCH/ECMA-262,%203rd%20edition,%20December%201999.pdf
    * section 9

 libseed/seed-types.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libseed/seed-types.c b/libseed/seed-types.c
index 9f5449b..a937f78 100644
--- a/libseed/seed-types.c
+++ b/libseed/seed-types.c
@@ -1760,7 +1760,7 @@ gboolean
 seed_value_to_boolean(JSContextRef ctx, JSValueRef val, JSValueRef* exception)
 {
     if (!JSValueIsBoolean(ctx, val) && !JSValueIsNumber(ctx, val)) {
-        if (!JSValueIsNull(ctx, val)) {
+        if (!JSValueIsNull(ctx, val) && !JSValueIsUndefined(ctx, val)) {
             seed_make_exception(eng->context, exception, "ConversionError",
                                 "Can not convert Javascript value to boolean");
             return FALSE;