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* Make keystore return `None` when a key doesn't exist * Fixes * More fixes * Update comment * Update primitives/keystore/src/lib.rs Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com> * Update client/keystore/src/local.rs Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com> * Address comments * Update client/keystore/src/local.rs Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com> Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>