Avoid panic in stty #455

Job	Run time
L10n/French Integration Test	1m 52s
L10n/Build and Test (ubuntu-latest, feat_os_unix)	2m 16s
L10n/Clap Error Localization Test	59s
L10n/Fluent Syntax Check	16s
L10n/Build and Test (macos-latest, feat_os_macos)	1m 49s
L10n/Multi-call Binary Install Test (ubuntu-latest, feat_os_unix)	4m 21s
L10n/Installation Test (Make & Cargo) (ubuntu-latest, feat_os_unix)	6m 15s
L10n/Multi-call Binary Install Test (macos-latest, feat_os_macos)	6m 26s
L10n/Installation Test (Make & Cargo) (macos-latest, feat_os_macos)	5m 41s
L10n/Build and Test (windows-latest, feat_os_windows)	5m 38s
L10n/Locale Embedding Regression Test	2m 26s
L10n/Locale Support Verification	7m 44s
	45m 43s

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