check if response is falsy and if so, call the on_failure function wi…

…th the error object instead of the response object

lib/codecov.js

@@ -88,7 +88,7 @@ var sendToCodecovV2 = function(codecov_endpoint, query, upload_body, on_success,
     }, function(err, response, result){
       if (err || response.statusCode !== 200) {
         console.log('    ' + (err || response.body));
-        return on_failure(response.statusCode, response.body);
+        return response ? on_failure(response.statusCode, response.body) : on_failure(err.code, err.message);
 
       } else {
         console.log('    Success!');