title: WARNING: builder-2.1.2 has an invalid nil value for @cert_chain
body: <p>How do I get rid of this warning or fix it?</p>
  
  <pre><code>gem install rails --version=3.0.10
  
  Fetching: activesupport-3.0.10.gem (100%)
  Fetching: builder-2.1.2.gem (100%)
  WARNING: builder-2.1.2 has an invalid nil value for @cert_chain
  Fetching: i18n-0.5.0.gem (100%)
  Fetching: activemodel-3.0.10.gem (100%)
  Fetching: rack-1.2.4.gem (100%)
  Fetching: rack-test-0.5.7.gem (100%)
  Fetching: rack-mount-0.6.14.gem (100%)
  Fetching: abstract-1.0.0.gem (100%)
  WARNING: abstract-1.0.0 has an invalid nil value for @cert_chain
  Fetching: erubis-2.6.6.gem (100%)
  Fetching: actionpack-3.0.10.gem (100%)
  </code></pre>