Fix crash on calling removeSelection with showing selection handlers

A crash occured on updating after calling removeSelection with showing
selection handlers. This was because some selection-handler code didn't
consider the case the selection index was -1 (-1 means there is no selection).
This patch fixes this crash.

Bug: 23299977
Change-Id: I736d315e073f773aec597522203015205a8da42b
1 file changed