message: Remove unnecessary else clause
diff: @@ -106,7 +106,7 @@ class SubscriptSymbol(Symbol):
  index_value = self.index_symbol.maybe_compute_value()
  if is_undefined(parent_value) or is_undefined(index_value):
  return Undefined(self.name)
  - else:
  +
  try:
  return parent_value[index_value]
  except (IndexError, KeyError, TypeError):
  