feat：完善项目

app/controller/account/instance.go

@@ -73,7 +73,7 @@ func (c *Instance) Login(account, password, captchaKey, captchaValue, ip string)
 
 // Logout 退出请求
 func (c *Instance) Logout() error {
-	if c.UID > 0 {
+	if c.Session != nil && c.UID > 0 {
 		service.Publish(config.EventForRedisHashDestroy, config.RedisKeyForAccount, utils.UintToString(c.UID))
 		service.HubMessage.UnregisterHandle(service.NewWebsocket(c.UIDToString(), nil))
 	}