[SQL] when SQL has more ';' then return unexcpted result

[maronghe]

What happened:
When I run SQL select * from student order by id ;; in mycli command line. Got unexcepted result and command line can not exist.

What you expected to happen:

Clear results and errors? 🤔

How to reproduce it (as minimally and precisely as possible):

1. Start arana server in local Mac.
2. Connect arana using Mycli.
3. Run SQL select * from student order by id ;;

Anything else we need to know?:

[maronghe]

Thanks for pointing out @icrzye .

[jjeffcaii]

This is a bug caused by empty query, and it's not supported yet, I'll add a patch to fix it. Thanks for figure out.