Calling .debug() breaks countQuery()

[WacSma]

Hi

Thanks for great work!

So here are steps to repro:
new Query('Account').debug().countQuery();

throws:
Error on line 1587, column 1: System.QueryException: unexpected token: ')' Class.Query.countQuery: line 1587, column 1

After removing the debug() call it works fine:
new Query('Account').countQuery();

This is because debug() calls toQueryString() -> formQueryStringPreformat() -> formFieldString(), which does functionFieldList.isEmpty() too early and adds Id to field set.

[HenryRLee]

Thanks for reporting an issue! It's a good catch.

Solved the bug with an additional copy in the debug function.