Fix video player crash (2)

[cewert]

Validate video content data is valid to prevent crash. This comes from the roku crash log.

Crashlog:

playstatetask    <uninitialized> 
params           roAssociativeArray refcnt=1 count:4 
m                roAssociativeArray refcnt=4 count:19 
global           Interface:ifGloba$1 state            String (VT_STR_CONST) val:"stop" 
Local Variables: 
   file/line: pkg:/components/video/VideoPlayerView.brs(598) 
#0  Function onstate(msg As Dynamic) As Voi$1 file/line: pkg:/components/video/VideoPlayerView.brs(615) 
#1  Function reportplayback(state As String) As Voi$1 Backtrace: 
'Dot' Operator attempted with invalid BrightScript Component or interface reference. (runtime error &hec) in pkg:/components/video/VideoPlayerView.brs(615)

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

if m.top.content.live

Issues

Ref #1164