Fix index error

[drppi44]

Sometimes this line raise indexerror
i didn't research this case

[albertyw]

I'd prefer to not use a try/except unless it's really needed. If there's an IndexError here, then that means len(requests) < target_count - 1. I'll make a separate PR to use an if statement to handle that case, and to make the later delete() still work.

[albertyw]

This has been superseded by #280.