fix: nc arguments might be null or an empty array, so we must handle it properly

[pedroferreira1]

Motivation

A beta tester was testing a blueprint that has a method without arguments. A transaction with this method was throwing an error in the frontend because the arguments were null. I also improved the UI for an empty list.

Fixes https://github.com/HathorNetwork/internal-issues/issues/305

Acceptance Criteria

• We should show a single dash (-) when a nano contract transaction has no arguments in the Transaction Detail screen.

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[andreabadesso]

Suggested change

	return " - ";
	return ' - ';