Don't include header size when checking for adapter size

We display the empty view when the adapter size is 0. However,
this count shouldn't include header size since we are only
interested in the adapter content. Note that teasers are not
included in the header since they are separately considered
by AnimatedAdapter.

b/17258260

Change-Id: Iebcee7e2b9ded0c43aabac8b3bcd93a423263017
2 files changed