Commander transaction:sign should expect empty mandatory or optional keys

[shuse2]

Expected behavior

It should support empty mandatory key or optional key

Actual behavior

When there is no mandatory key or optional key, it fails with error findIndex cannot be called error

Steps to reproduce

./bin/run transaction:sign '{"id":"2082398145299954312","type":8,"senderPublicKey":"d9f0569230016a22206dd123900f245a71b479b5463c7ad235e4f4e933e181e2","senderId":"8363255854011484280L","nonce":"3","fee":"10000000","signatures":[],"asset":{"amount":"10000000","recipientId":"3077205662092022585L"}}' --optional-key="e072e3987e9aad9ed7e5735b89af817d16835dbc646d2463928912f42ca18176" --optional-key="c39ff325a5329cfe0f1b122302e9e7df9cb0d9d513770fddc79edaf9106abcff" --optional-key="2675782a6b2c90d9d555343d7a0ac6c6a558ba0484f0ca2f6db0c0dd10a72624" --networkIdentifier=11a254dc30db5eb1ce4001acde35fd5a14d62584f886d30df161e4e883220eb7 --passphrase="table grocery kiss hip retreat chief fringe trash egg valve remind cigar" --passphrase="rally deposit crop embark bronze mom mechanic power walnut melt mention april"

Which version(s) does this affect? (Environment, OS, etc...)

4.0-