On the other hand ... "empty" is a pretty common notion of "no item"
I wouldn't mind too much about not reusing the term found in the feature name.

I agree sometime the feature name would be good enough and we are sorry to reuse the same term ...

but really, when you read empty .. you know what it means ;)

for me, I would use

-- Is Current queue empty?
or
-- Is Current container empty?


but once again, I am ok with your comment if you prefer it.