title: Create a Kafka topic if it does not already exist with Python-kafka admin client?
body: <p>With Python-kafka admin client I know how to create and delete topics.</p>
  <p>But is there any way to check if that topic exists or not? If not then only I wanted to create it.
  How can I do that in python -kafka admin client?
  I didnt see anything in the documentation.</p>