Added a check for when the body variable is undefined.  This is triggered when many requests are submitted in quick succession and the Jira server doesn't return a valid response.  The request should be retried if this error is thrown.
Preparing for release
Merge pull request #24 from AlexCline/fix-undefined-body-in-find-issue

Added a check for when the body variable is undefined.
Merge branch 'master' of github.com:steves/node-jira