[Bug] "Optional" rendering of variables seems broken

[martinhalford]

Based on previous versions of TemplateMark rendering into AgreementMark, we used to be able to render optional variables depending on if the optional data existed, or not.

EG 1:

In this example, the scalar attribute age is optional.

@template
concept TemplateData {
    o String name
    o Address address
    o Integer age optional
    o MonetaryAmount salary
    o String[] favoriteColors
    o Order order

We used to be able to use the following syntax in TemplateMark:

- {{#optional age}} You are *{{this}}* years old{{/optional}}

This now renders as:

" - You are "

We were expecting:

" - You are 42 years old" --or-- nothing, if age is undefined.

Screenshot:

EG 2:

In this example, the object attribute signature is optional.

concept Party {
  o String partyId
  o String fullName
  o String email
  o String mobile
  o Address address
  o Signature signature optional
}

concept Signature {
  o String walletAddress
  o DateTime signedAt
}

We used to be able to use the following syntax in TemplateMark:

- **{{fullName}}**{{#optional signature}} (Signed: {{signedAt}}, Wallet: {{walletAddress}}){{/optional}}

This now renders as:

" - Fred Bloggs (Signed: "

We were expecting:

" - Fred Bloggs (Signed: 2024-01-15T15:45:00.000Z, Wallet: 0xabcdef1234567890abcdef1234567890abcdef12"

Screenshot:

Summary

Is this a bug or are we using old syntax which is no longer supported?