Fix NullPointerException in RecipientsEditor.

In function PointToPosition, should check if mLayout
is NULL before call function getExtendedPaddingTop
because mLayout is refered in getExtendedPaddingTop.

Change-Id: I750313c3a4bceb7213433cf3d110ea9e87cee0b8
Signed-off-by: Bin Li <libin@marvell.com>