hg: openjfx/8u/rt: 8144501: TreeTableView's selectedItems reports include null items.

[kevin.rushforth at oracle.com]

Changeset: 45f42124f7b4
Author:    jgiles
Date:      2016-05-16 11:29 +1200
URL:       http://hg.openjdk.java.net/openjfx/8u/rt/rev/45f42124f7b4

8144501: TreeTableView's selectedItems reports include null items.

! modules/controls/src/main/java/javafx/scene/control/MultipleSelectionModelBase.java
! modules/controls/src/main/java/javafx/scene/control/TableView.java
! modules/controls/src/main/java/javafx/scene/control/TreeTableView.java
! modules/controls/src/test/java/javafx/scene/control/MultipleSelectionModelImplTest.java
! modules/controls/src/test/java/javafx/scene/control/TreeTableViewSelectionModelImplTest.java