Tests Debugger.Scope.emptyReason.

Running test: testEmptyReason
Paused in empty:
  local: no-variables
Paused in allUnavailable:
  local: all-unavailable
Paused in blockAllUnavailable:
  block: all-unavailable
  local: <absent>
Paused in someAvailable:
  local: <absent>
Paused in inner:
  local: no-variables
  closure: <absent>
