itemJSON produces invalide JSON when item.likes is not set

This issues is related to Alfresco Share Services.

itemJSON macro is defined in file templates/webscripts/org.alfresco/slingshot/documentlibrary-v2/item.lib.ftl

The part relative to "likes" processing is:
{{<#if item.likes??>"likes":
{
"isLiked": ${item.likes.isLiked?string},
"totalLikes": ${item.likes.totalLikes?c}
}</#if>,}}

When item.likes doesn't exists, the JSON likes section isn't produced in output, but the comma is written.

To correct this use:
{{<#if item.likes??>"likes":
{
"isLiked": ${item.likes.isLiked?string},
"totalLikes": ${item.likes.totalLikes?c}
},</#if>}}