Locust can not count failure request number in WEB GUI

[yisake]

Attached my test script and screenshot. Locust didn't count the whole number for failed request and just show every Exception on WEB GUI.

`#encoding=utf-8
from locust import HttpLocust, TaskSet, task , events
import requests
import time

class WebsiteTasks(TaskSet):

@task
def page(self):
    start_time = time.time()
    try:
        requests.get("http://127.0.0.1:8000/index")
    except Exception,e:
        total_time = int((time.time() - start_time) * 1000)
        events.request_failure.fire(request_type="测试GET请求", name="http://127.0.0.1:8000/index", response_time=total_time, exception=e)
    else:
        total_time = int((time.time() - start_time) * 1000)
        events.request_success.fire(request_type="测试GET请求", name="http://127.0.0.1:8000/index", response_time=total_time, response_length=0)

@task
def index(self):
    self.client.get("http://httpbin.org/cookies/set/sessioncookie/123456789")

class WebsiteUser(HttpLocust):

host = ''
task_set = WebsiteTasks
min_wait = 500
max_wait = 500`

Main page

Failure page

[yisake]

All of the Exception is the same type of NewConnectionError. ~~

[heyman]

This was most likely related to #451 and #452, which has now been fixed.