title: ruby koans about_nil.rb -- question fr/ newbie
body: <p>I'm an <strong>absolute beginner</strong> in programming. I am gravitating to ruby and have set up the koans. The section begins with: </p>
  
  <pre><code>def test_you_dont_get_null_pointer_errors_when_calling_methods_on_nil
  </code></pre>
  
  <p>Please explain this line:</p>
  
  <pre><code>rescue Exception =&gt; ex
  </code></pre>
  
  <p>I've figured out the first two koans in this section. </p>