fix for Railo w/ "complete NULL support" ON

In Railo Server Admin, when Null Support is set to "complete support", you receive a HTTP 405 error when attempting any REST call.  The issue is the requestObj.verb is NULL due to the 'httpMethodOverride'.  Adding this additional check on the condition fixes this.
Merge pull request #207 from damonmiller/patch-1

fix for Railo w/ "complete NULL support" ON