Mac exception on quitting application

[csatt]

Mac only:

If the application is quit using one of the following:
IV Swinger 2 menu -> Quit IV Swinger 2
Command Q
Right-click -> Quit on dock icon
an editor window with something like the following comes up:

Unexpected error: <type 'exceptions.SystemExit'>
Traceback (most recent call last):
File "IV_Swinger2_gui.py", line 8480, in main
File "IV_Swinger2_gui.py", line 1836, in run
File "lib-tk/Tkinter.py", line 1125, in mainloop
File "lib-tk/Tkinter.py", line 218, in _exit
SystemExit: 0

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Please copy/paste the above and send it to csatt1@gmail.com

Alternately, you may attach this file:
/var/folders/yj/k_91_km93gb2w8t_pcbgyyth0000gn/T/tmpob5lBk

This does NOT happen when the application is closed by clicking on the red close button in the upper right corner.

It is harmless but should be fixed.

[csatt]

NOTE: I "cheated" and updated the Mac .dmg with the fix in release 2.5.2 to avoid having to do another whole release just for this bug. Since the code change is at the very end of IV_Swinger2_gui.py, the line numbers for any exception in this file will still be correct.