[mythtv] Strange problem with Mythweb in 0.11

[Jonathan Kolb]

It's not trying to add to the $Channels array there.  It's trying to add to
the $Channels[$show->chanid] array.  Which isn't specifically set to
array().  Odd that it doesn't give you that same error on line 57, as it's
doing the same thing with $Programs.

Jon