chore(submit_package): use `unwrap_or_default` instead of `.unwrap()` #728

Job	Run time
Rust Clippy	2m 1s
Rust Docs	1m 53s
Rust Formatting	14s
Build & Test (stable, blocking-https-rustls)	57s
Build & Test (stable, default)	1m 41s
Build & Test (stable, async-https-native)	1m 9s
Build & Test (stable, blocking-https-bundled)	2m 10s
Build & Test (stable, blocking)	1m 3s
Build & Test (stable, async-https-rustls)	1m 19s
Build & Test (stable, blocking-https)	1m 11s
Build & Test (1.63.0, default)	9m 23s
Build & Test (stable, async-https-rustls-manual-roots)	1m 14s
Build & Test (1.63.0, blocking-https-native)	8m 20s
Build & Test (stable, async)	1m 10s
Build & Test (stable, blocking-https-native)	1m 0s
Build & Test (1.63.0, blocking-https)	8m 19s
Build & Test (1.63.0, async-https-rustls)	8m 35s
Build & Test (1.63.0, async)	8m 26s
Build & Test (stable, async-https)	1m 3s
Build & Test (1.63.0, blocking-https-bundled)	10m 22s
Build & Test (1.63.0, async-https-native)	8m 29s
Build & Test (1.63.0, blocking-https-rustls)	8m 33s
Build & Test (1.63.0, async-https)	8m 16s
Build & Test (1.63.0, async-https-rustls-manual-roots)	8m 23s
Build & Test (1.63.0, blocking)	8m 20s
	1h 53m 31s

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