Extractable incorrectly short-circuiting if the last clause in the for comprehension resolves to NotProvided

[daviddenton]

Example test case:

      val ex = Extractable.mk {
        request: Request => for {
          req <- Query.required.int("req") <--? request
          opt <- Query.optional.int("optional") <--? request
        } yield Some((req, opt))
      }

      ex <--? Request("/?req=123") shouldBe Extracted((Some(123), None))

      Fails with:  NotProvided was not equal to Extracted((Some(123),None)) 

[daviddenton]

Fixed in 12.18.2