Shared state null values -> Elemental JsonUtil NPE

Just a heads up, in upgrading to Vaadin 7.4.x we noticed that there’s a missing null check in the elemental.json.impl.JsonUtil.quote() method which causes havoc if you have null values in Shared State.

It may be intended behaviour for it to blow with nulls in which case the Vaadin stack above should perform the null check.

Reported here: