Fix version number being undefined when crate only has unstable versions
Fix version number being undefined when crate only has unstable versions

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