[json-glib] reader: Make json_reader_get_value return a value for the null type. This matches the json_reader_is

[Emmanuele Bassi <ebassi src gnome org>]

commit 21b9dcd423d3def6ba871de8d9e4e6916f2954dc
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue Nov 24 22:03:32 2015 +1300

    reader: Make json_reader_get_value return a value for the null type. This matches the 
json_reader_is_value check.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=758580

 json-glib/json-reader.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/json-glib/json-reader.c b/json-glib/json-reader.c
index a4c5838..6117ced 100644
--- a/json-glib/json-reader.c
+++ b/json-glib/json-reader.c
@@ -843,7 +843,7 @@ json_reader_get_value (JsonReader *reader)
 
   node = reader->priv->current_node;
 
-  if (!JSON_NODE_HOLDS_VALUE (node))
+  if (!JSON_NODE_HOLDS_VALUE (node) && !JSON_NODE_HOLDS_NULL (node))
     {
       json_reader_set_error (reader, JSON_READER_ERROR_NO_VALUE,
                              _("The current position holds a “%s” and not a value"),