Know nothing about the book or movies.
But is this brief article right about the book/movie plot?
IIRC, the anti-Christ is for EVERYone, and comes BEFORE the rapture (believers being taken). The anti-christ is destroyed. Thus, there is nothingness after the rapture.
Sounds like the plot is a bit wrong WRT the Bible.
So, no, there is not nothingness after the rapture and the last 3.5 years of that 7 year period is sheer terror.