Fix crash on home screen

[cewert]

Comes from roku crash log

'Dot' Operator attempted with invalid BrightScript Component or interface reference. (runtime error &hec) in pkg:/components/home/HomeItem.brs(65) 
Backtrace: 
#0  Function itemcontentchanged() As Voi$1 file/line: pkg:/components/home/HomeItem.brs(65) 
Local Variables: 
global           Interface:ifGloba$1 m                roAssociativeArray refcnt=2 count:15 
itemdata         roSGNode:HomeData refcnt=1 
usersettings     <uninitialized> 
unwatchedepisodecountsetting <uninitialized> 
playedindicatorleftposition <uninitialized> 
tmpsetting       <uninitialized> 
extraprefix      <uninitialized> 
textextra        <uninitialized> 
BRIGHTSCRIPT: ERROR: roSGNode.<lookup>: Rendezvous aborted for LoadItemsTask: pkg:/components/home/LoadItemsTask.brs(55)

userSettings = m.global.session.user.settings

Ref #1164