[srrietveld bug] save project, press new->crash

[dif...@diffpy.org]

reporter: monica....@unimi.it

summary: save project, press new->crash

description: project saved. pressed new, crash!

component: srrietveld

version: 1.0beta-r6746-20110902

traceback:
Traceback (most recent call last):
File "C:\xray\srRietveld\Python26\lib\site-packages\diffpy.srrietveld-1.0beta_r6746_20110902-py2.6.egg\diffpy\srrietveld\gui\errorwrapper.py", line 61, in _f
return func(*args, **kwargs)
File "C:\xray\srRietveld\Python26\lib\site-packages\diffpy.srrietveld-1.0beta_r6746_20110902-py2.6.egg\diffpy\srrietveld\gui\projecttreectrl.py", line 303, in getCurrentFitNode
parent = self.GetItemParent(node)
File "C:\xray\srRietveld\Python26\lib\site-packages\wx-2.8-msw-unicode\wx\_controls.py", line 5413, in GetItemParent
return _controls_.TreeCtrl_GetItemParent(*args, **kwargs)
ValueError: invalid null reference in method 'TreeCtrl_GetItemParent', expected argument 2 of type 'wxTreeItemId const &'