{{#optional}} variables do not render in 'draft' when --unquoteVariables flag present.

[martinhalford]

Describe the bug
For template models using {{#optional}} variables, an exception Cannot read property 'replace' of undefined is thrown during draft command if --unquoteVariables flag is present.

To Reproduce
Consider the following template archive.

empty-contract-cta.zip

model.cto

namespace org.accordproject.empty

import org.accordproject.cicero.contract.* from https://models.accordproject.org/cicero/contract.cto
import org.accordproject.cicero.runtime.* from https://models.accordproject.org/cicero/runtime.cto

// Template model
asset EmptyContract extends AccordContract {
    o Boolean yesNoFlag optional
}

// Request
transaction EmptyRequest extends Request {
}

// Response
transaction EmptyResponse extends Response {
}

grammar.med.tm

{{#optional yesNoFlag}}The yesNoFlag is {{this}}!{{/optional}}

data.json

{
  "$class": "org.accordproject.empty.EmptyContract",
  "yesNoFlag": true,
  "contractId": "31b2897f-308c-42e1-9d71-1b50f33e57bf"
}

Run the draft command

cicero draft --template . --data ./data.json --output ./text/sample.md

Executes correctly! :-)

11:07:50 PM - info: Creating file: ./text/sample.md
11:07:50 PM - info: The yesNoFlag is true!

Try the same command with --unquoteVariables set...

cicero draft --template . --data ./data.json --output ./text/sample.md --unquoteVariables

Returns the following error.

11:11:22 PM - error: Cannot read property 'replace' of undefined

Additional context
Cicero version 0.21.3

[jeromesimeon]

Can be reproduced directly with the markdown-transform:

bash-3.2$ ~/git/markdown-transform/packages/markdown-cli/index.js transform --from data --via ciceromark_unquoted --to markdown_cicero --template text/grammar.tem.md --model model/model.cto --input data.json --contract 
11:36:49 AM - error: Cannot read property 'replace' of undefined

[jeromesimeon]

Fixed in #297
Test with that fix:

bash-3.2$ ~/git/markdown-transform/packages/markdown-cli/index.js transform --from data --via ciceromark_unquoted --to markdown_cicero --template text/grammar.tem.md --model model/model.cto --input data.json --contract 
12:02:32 PM - info: 
The yesNoFlag is true!

[jeromesimeon]

Closing. Please reopen (or open a new issue) if any further problem.