Fix ExtrasItem crash

[cewert]

Prevent crash by validating node refs and recreating as needed. Comes from roku.com crash log:

Invalid value for left-side of expression. (runtime error &he4) in pkg:/components/extras/ExtrasItem.brs(10) 
Backtrace: 
#0  Function showcontent() As Voi$1 file/line: pkg:/components/extras/ExtrasItem.brs(11) 
Local Variables: 
global           Interface:ifGloba$1 m                roAssociativeArray refcnt=2 count:3 
cont             roSGNode:ExtrasData refcnt=1 
BRIGHTSCRIPT: ERROR: roUrlTransfer.GetToString: Sync-wait interrupted: pkg:/source/api/baserequest.brs(75)

which points to this line after running build-prod on 2.1.2:

m.name.text = cont.labelText

Issues

Ref #1164