Running rust2rpm with a crate name (or explicitly set version) that doesn't exist on crates.io, rust2rpm crashes, generating a backtrace, and ABRT entry (for which users are reporting bugs).
rust2rpm should not crash but exit gracefully when encountering a 404 error from crates.io.
Metadata Update from @zbyszek:
- Issue assigned to zbyszek
Commit afbee03 fixes this issue
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