♻️ Guard against KeyError escape from validate_settings_rules#289
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validate_settings_rules could theoretically raise a KeyError if a future rule bypasses the get_rules_supported_by_settings pre-filter. The catch is added defensively so any such escape is wrapped as an actionable InvalidSettingsError rather than a generic crash.
The "requires the optional" phrase only appears in MissingOptionalDependencyError.install_hint, not in ModuleNotFoundError messages. The string check in _build_server_app could never match, so it was dead code that added noise without effect.
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Summary
Refs #169
validate_settings_rulescould theoretically raise aKeyErrorif a future rule bypasses theget_rules_supported_by_settingspre-filter. The catch is added defensively so any such escape is wrapped as an actionableInvalidSettingsErrorrather than a generic crash.