Fix Notice error: Undefined index 

Notice: Undefined index: id in E:\web\...\whatsprot.class.php on line 342
object(ProtocolNode)#494 (4) {
  ["_tag"]=>
  string(7) "message"
  ["_attributeHash"]=>
  array(3) {
    ["from"]=>
    string(26) "85253876449@s.whatsapp.net"
    ["type"]=>
    string(4) "chat"
    ["t"]=>
    string(10) "1362627450"
  }
  ["_children"]=>
  array(1) {
    [0]=>
    object(ProtocolNode)#493 (4) {
      ["_tag"]=>
      string(9) "composing"
      ["_attributeHash"]=>
      array(1) {
        ["xmlns"]=>
        string(37) "http://jabber.org/protocol/chatstates"
      }
      ["_children"]=>
      NULL
      ["_data"]=>
      string(0) ""
    }
  }
  ["_data"]=>
  string(0) ""
}

Notice: Undefined index: id in E:\web\...\whatsprot.class.php on line 349
object(ProtocolNode)#489 (4) {
  ["_tag"]=>
  string(7) "message"
  ["_attributeHash"]=>
  array(3) {
    ["from"]=>
    string(26) "85253876449@s.whatsapp.net"
    ["type"]=>
    string(4) "chat"
    ["t"]=>
    string(10) "1362627037"
  }
  ["_children"]=>
  array(1) {
    [0]=>
    object(ProtocolNode)#488 (4) {
      ["_tag"]=>
      string(6) "paused"
      ["_attributeHash"]=>
      array(1) {
        ["xmlns"]=>
        string(37) "http://jabber.org/protocol/chatstates"
      }
      ["_children"]=>
      NULL
      ["_data"]=>
      string(0) ""
    }
  }
  ["_data"]=>
  string(0) ""
}