feature request: optional template items

[janweigel]

Hello, It would be a great addition if template items could be defined as optional as it is common practice when using conventional commit style. For example if the template is {type} {scope}: {message} it would be great if the {scope} could be defined as optional like {type} {scope?}: {message}

Or even better, if a complete block could be defined as optional. Which means if we have a template: {type} - {scope}: {message} the whole block could be optional if no value for the containing variable is set: {type}{ - {scope}?}: {message}