Password for creating an Identity should be mandatory or optional?

[rauljareno]

Right now, the password parameter passed to create an identity is accepting null values, so it seems to be an optional value. Makes sense that this parameter is optional? just for having it in mind for validations implemented in the wrapper, as it is now mandatory in the wrapper.

Iden3mobile.newIdentity(
"$storePath/alias",
null,
web3Url,
1000,
null
) { event -> print(event) }

Result -> returns the identity
Expected -> Returns error asking to introduce a valid password as parameter