JsonRenderer should put a 'null' instead of just 2 commas together

[GoogleCodeExporter]

JsonRenderer doesn't generate valid JSON as it will create something like

,,

where it should be

,null,

Attached is a diff that will resolve the issue

Original issue reported on code.google.com by ba...@guild1.com on 27 Jun 2012 at 10:29

Attachments:

• diff.txt