TEST/MINOR: Prevent nil pointer dereference.

Avoid closing a failed connection in e2e test canary-deployment.

Author: Mo3m3n

deploy/tests/e2e/canary-deployment/percentage_test.go

@@ -33,7 +33,10 @@ func (suite *CanaryDeploymentSuite) Test_Response_Percentage() {
 				counter := 0
 				for i := 0; i < 10; i++ {
 					res, cls, err := suite.client.Do()
-					suite.NoError(err)
+					if res == nil {
+						suite.T().Log(err)
+						continue
+					}
 					defer cls()
 					if res.StatusCode == 200 {
 						body, _ := ioutil.ReadAll(res.Body)