Sender name is mandatory in letter-simple

[Morwdan]

Creating a letter without a sender name via letter-simple results in the following error…:

error: expected string or array, found none
    ┌─ @preview/letter-pro:3.0.0/src/lib.typ:539:12
    │
539 │     author: sender.name,
    │             ^^^^^^^^^^^

…as the sender name is also used to specify the document author (which doesn’t seem to accept none):

typst-letter-pro/src/lib.typ

Lines 536 to 540 in 0bc8f4c

	// Configure page and text properties.
	set document(
	title: subject,
	author: sender.name,
	)

According to the documentation of letter-simple, the sender name can be none, so I assume this behavior is not intended. I worked around the issue with this change, but being new to Typst, there is probably a cleaner fix:

  // Configure page and text properties.
  if sender.name != none {
    set document(
      title: subject,
      author: sender.name
    )
  }
  else {
    set document(
      title: subject,
    )
  }

And thanks for this project!

[Sematre]

Thanks for reaching out. This is indeed a bug. I'll open a pull request.