Suggestion: Omit fields given an empty array

[ajclaasen]

Hello, thank you again for all of your hard work on this project.

I have a suggestion:

In textual data representations, empty arrays are often used to represent empty to-many relationships. (one such example)
A monster's immunities or reactions would be two cases of a to-many relationship. They can have anywhere between 0 and many immunities and/or reactions.
In vellum-monster, if an empty array is passed to a field expecting an array, such as immunities or reactions, it will still show the Immunities or Reactions text, even though they have no content.

My suggestion would be to hide these fields in the end result if the content passed to them is empty.

Given the following HTML:

<vellum-monster>
  hp="200"
  ac="18"
  immunities='[]'
  reactions='[]'
</vellum-monster>

Current outcome:

Hit Points 200
Armor Class 18
Damage Immunities

Reactions

Suggested outcome:

Hit Points 200
Armor Class 18

Thank you again for your work! Let me know what you think!