display 'please add email' message only when email is not already added
display 'please add email' message only when email is not already added

rust-lang/crates.io,steveklabnik/crates.io,rust-lang/crates.io,rust-lang/crates.io,rust-lang/crates.io,steveklabnik/crates.io,steveklabnik/crates.io,steveklabnik/crates.io