Panic when Timeout if setup output variable in function

[chucobo124]

Here is the issue when I do this.

func FetchReq() (ids []string, err  error) {
   err = hystrix.Do("FetchA", func() error {
        for _ , id := range fetchRequest() {
           ids = append(ids, fmt.Sprintf("%d", id))
        }
       
    }
    if len(str) == 0 {
        return nil , errors.New("No response")
    }
    return str , nil 
}

If there is a timeout in fetchRequest we will get the panic say ids is nil in for block

It's similar to this problem.

https://play.golang.org/p/5LEjvISGuE4

I think we can have another way to solve this error when timeout.

solving like this to exit when timeout.
https://play.golang.org/p/PRsgLmUMSsQ

The error can be referred to this line.

https://github.com/afex/hystrix-go/blob/master/hystrix/hystrix.go#L205