Allow null body

See oauthjs#69

Author: thomseddon

lib/authorise.js

@@ -56,7 +56,7 @@ function Authorise (config, req, next) {
 function getBearerToken (done) {
   var headerToken = this.req.get('Authorization'),
     getToken =  this.req.query.access_token,
-    postToken = this.req.body && this.req.body.access_token;
+    postToken = this.req.body ? this.req.body.access_token : undefined;
 
   // Check exactly one method was used
   var methodsUsed = (headerToken !== undefined) + (getToken !== undefined) +