message: utils: fix Antlr4Selection.eq_relaxed
diff: @@ -294,10 +294,8 @@ class Antlr4Selection(list, iAntlr4GramElem):
  return self.eq_relaxed(other[0])
  else:
  return False
  -
  - if len(self) != len(other):
  + if not isinstance(other, Antlr4Selection) or len(self) != len(other):
  return False
  -
  for a, b in zip(self, other):
  if not a.eq_relaxed(b):
  return False
  