Issue-1759 Fixing NLP for invalid cookie value

[Nishant-sehgal]

If An invalid header is set a NLP exception is thrown.

Karate internally uses ClientCookieDecoder.STRICT.decode(value) to parse the cookies and whenever an Invalid Cookie is set it return null and code fails with NLP while calling cookie.name()

Before the change it fails with NLP:

• Relevant Issues : Cannot invoke "karate.io.netty.handler.codec.http.cookie.Cookie.name()" because "cookie" is null #1759
• Relevant PRs : (optional)
• Type of change :
  • New feature
  • Bug fix for existing feature
  • Code quality improvement
  • Addition or Improvement of tests
  • Addition or Improvement of documentation