closing Command History gives traceback

[Elaine Meng]

Traceback (most recent call last):
File "/Users/chimera/Applications/Chimera2_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/chimera/core/ui/graphics.py", line 50, in _redraw_timer_callback
if not self.view.draw_new_frame():
File "/Users/chimera/Applications/Chimera2_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/chimera/core/graphics/view.py", line 152, in draw_new_frame
self._call_callbacks('new frame')
File "/Users/chimera/Applications/Chimera2_Daily.app/Contents/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/chimera/core/graphics/view.py", line 598, in _call_callbacks
for cb in cbs:
wx._core.wxAssertionError: C++ assertion "GetEventHandler() == this" failed at /private/var/tmp/chimera2_build/develop/chimera2/build/tmp/wxPython_Phoenix-3.0.3.dev1719+62a2221/ext/wxWidgets/src/common/wincmn.cpp(478) in ~wxWindowBase(): any pushed event handlers must have been removed

[Elaine Meng]

seems to be duplicate of #120 but another way to get the same/similar error is to close the history dialog