Log file need to be created, but it is removed when cleared

[damienflament]

Hi,

Maybe I don't understand the usage of the xog command, but something goes strange when using it.

When running xog the first time, it complains about the non existing log file:

@ xontrib load xog
@ xog
Traceback log file doesn't exist.

So, I create it:

@ touch $XONSH_TRACEBACK_LOGFILE
@ xog

And it works.

@ raise Exception
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
Exception
@ xog
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
Exception

But when I make Xog clear the log file, it deletes it.

@ xog --clear
@ xog
Traceback log file doesn't exist.

Is it an expected behavior ?