Ticket #11053 Throw NPE when create new Tree()

I’m using 7.0.2.nightly-7af5b3fceb75b6f505a9a6d0a843b788bb06d9a7-393 now, it not work for 392 release too. My application run smoothly when i revert back to 7.0.2.nightly-33fa6fa723db6945319e81bf39d0cc88ba0a6480-391. What i do is just create a new tree.

The exception is something like this:
Caused by: java.lang.NullPointerException
at com.vaadin.ui.Tree.cleanupExpandedItems(Tree.java:1691)
at com.vaadin.ui.Tree.setContainerDataSource(Tree.java:850)
at com.vaadin.ui.AbstractSelect.(AbstractSelect.java:298)
at com.vaadin.ui.Tree.(Tree.java:163)
at com.vaadin.ui.Tree.(Tree.java:153)
at com.vaadin.ui.Tree.(Tree.java:144)

This was fixed today and should not occur with the next nightly (