can't handle trailing comma on destroy uniq_id list

```
dweb-cli(master)$ ./_exe/liquidweb-cli cloud server  destroy --uniq_id 0NAP0T,J95ZYX,0HS1TM,L4WYMH,6UZ9CT,
destroyed: 0NAP0T
destroyed: J95ZYX
destroyed: 0HS1TM
destroyed: L4WYMH
destroyed: 6UZ9CT
A fatal error has occurred:

LW::Exception::Input::Multiple: The following input errors occurred:
The required field 'uniq_id' was missing a value.
```