Log files only display erroring queries upon error

[arvind-murty]

If I exit the execution (with --num-tries set to 1) before an AssertionError is thrown, there is only one log file produced (database0-cur.log), which has all of the successfully executed queries.

If instead an AssertionError is thrown, then there are two log files produced (database0-cur.log and database0.log), both of which only have the unsuccessful query.

I only found this behavior on MySQL, but it may also occur with other DBMS's (they never errored during my testing).