Only set non-None properties

[akhilles]

Note

Medium Risk
Changes the shape of emitted properties by removing keys that were previously present with None, which may affect downstream consumers expecting those fields to exist.

Overview
Updates multiple generics/*.zen component templates to only add optional entries to properties when the corresponding config value is set, instead of always emitting keys with None.

This normalization is applied across Bjt, Capacitor, Crystal, Diode, FerriteBead, Inductor, Led, Mosfet, MountingHole, Resistor, and Thermistor, with NetTie also avoiding legacy fields when variant is used. Tvs is refactored to build a properties dict similarly and pass it into Component.

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