Special-case no-output evaluations
Special-case no-output evaluations

Without a template, "const _I: i8 = 42; fn main() {}" will not output
anything, which can cause doubts to the user, if the bot is still online.

tilpner/rust-playpen,rust-lang/rust-playpen,rust-lang/rust-playpen,plietar/pony-playpen,plietar/pony-playpen,rust-lang/rust-playpen,plietar/pony-playpen,tilpner/rust-playpen,rust-lang/rust-playpen,plietar/pony-playpen,tilpner/rust-playpen,tilpner/rust-playpen