Don't auto-generate emtpy http-data files (#5039)
Don't auto-generate emtpy http-data files (#5039)

If the data file would consist of an empty array, then don't write it as
this is the default if a file does not exist.

Co-authored-by: Justin Geibel <48bcd14f59eb40d23faea74ffe3fc874e7cc46a2@gmail.com>
rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io