crasher with unusual combination of repeated params, param forwarding, and nothing

[retronym]

class C(val f: Any*)

class D(override val f: Nothing) extends C(f)

./bin/dotc sandbox/test.scala
exception while transforming (f: Nothing) extends C(Predef.genericWrapArray([f()])) {
  override <accessor> def f(): Nothing
  def f(): scala.collection.Seq = this.f()
} of class class dotty.tools.dotc.ast.Trees$Template # 897
exception while transforming class D(f: Nothing) extends C(Predef.genericWrapArray([f()])) {
  override <accessor> def f(): Nothing
  def f(): scala.collection.Seq = this.f()
} of class class dotty.tools.dotc.ast.Trees$TypeDef # 898
exception while transforming package <empty> {
  class C(f: scala.collection.Seq) extends Object() {
    <accessor> def f(): scala.collection.Seq
  }
  final lazy module val C: C$ = new C$()
  final module class C$() extends Object() { this: C$ =>}
  class D(f: Nothing) extends C(Predef.genericWrapArray([f()])) {
    override <accessor> def f(): Nothing
    def f(): scala.collection.Seq = this.f()
  }
  final lazy module val D: D$ = new D$()
  final module class D$() extends Object() { this: D$ =>}
} of class class dotty.tools.dotc.ast.Trees$PackageDef # 915
exception occurred while compiling sandbox/test.scala
Exception in thread "main" java.util.NoSuchElementException: head of empty list
    at scala.collection.immutable.Nil$.head(List.scala:420)

Followup from #617, /cc @smarter

[felixmulder]

This no longer crashes dotc and gives a similar error message when compiling compared with scalac.