chore(meta-ctl): refine stderr output for metactl

[drmingdrmer]

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Summary

chore(meta-ctl): refine stderr output for metactl

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
databend	⬜️ Ignored (Inspect)			May 11, 2023 0:02am

[BohuTANG]

error: empty string literal in `eprintln!`
   --> src/binaries/metactl/main.rs:234:5
    |
234 |     eprintln!("");
    |     ^^^^^^^^^^--^
    |               |
    |               help: remove the empty string
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string
    = note: `-D clippy::println-empty-string` implied by `-D warnings`

error: empty string literal in `eprintln!`
   --> src/binaries/metactl/main.rs:256:9
    |
256 |         eprintln!("");
    |         ^^^^^^^^^^--^
    |                   |
    |                   help: remove the empty string
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string

error: empty string literal in `eprintln!`
   --> src/binaries/metactl/main.rs:262:9
    |
262 |         eprintln!("");
    |         ^^^^^^^^^^--^
    |                   |
    |                   help: remove the empty string
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#println_empty_string