send not handling error callback

[summanerd]

I'm getting the following error

TypeError: Cannot read property 'ok' of null
               at .../node_modules/apostle.io/lib/index.js:37:10

the function at this location

(request || superagent)
		.post(apostle.deliveryEndpoint)
		.type('json')
		.send(payload)
		.set('Authorization', 'Bearer ' + apostle.domainKey)
		.set('Apostle-Client', 'JavaScript/v0.1.1')
		.end(function(res){
			if(res.ok){
				promise.fulfill()
			}else{
				promise.reject('error', res)
			}
		})

when I add a param to handle the possible error all is well. When I look at superagent package, I confirmed they use the error first callback pattern common in node.

I will create a pull request as this is breaking my current project. if this is in fact an error please. Otherwise please assist.

[snikch]

Hey there, a PR would be great. We recently upgraded the superagent package due to security concerns, so it's likely this broke it. Thanks!

[summanerd]

done. I could also add some unit tests that could catch this type of thing. It would require some updates to sinon package and maybe the test process. Let me know if you would like me to do another PR.

[snikch]

If you're happy to add these tests, they would be much appreciated!