package --js --library (incorrectly) requires a main class to be present.

[rmgk]

Version(s)

0.1.3, 0.1.4

Describe the bug

scala-cli package --js --library test.scala produces [error] No main class found if there is no main class in test.scala.
Thus, no output is generated at all.

To Reproduce

sample test.scala for the above command.

object Main { val x = 4 }

Expected behaviour

This works with scala-cli package --library test.scala (i.e., no --js) and js packaging also works if one provides an empty main class, thus I would expect the js library to produce working output even if there is no main class.