fix bug that appears if datatype in the project tree is renamed to wrong name (keyword, existend type,...)

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/_core.py", line 16765, in <lambda>
lambda event: event.callable(*event.args, **event.kw) )
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/lib/expando.py", line 126, in _adjustCtrl
numLines = self.GetNumberOfLines()
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/_core.py", line 16710, in __getattr__
raise PyDeadObjectError(self.attrStr % self._name)
PyDeadObjectError: The C++ part of the TreeTextCtrl object has been deleted, attribute access no longer allowed.

--- a/IDEFrame.py	Fri May 06 16:16:30 2016 +0300
+++ b/IDEFrame.py	Fri May 06 18:04:40 2016 +0300
@@ -1675,8 +1675,6 @@
             if message or abort:
                 if message:
                     self.ShowErrorMessage(message)
-                item = event.GetItem()
-                wx.CallAfter(self.ProjectTree.EditLabel, item)
                 event.Veto()
             else:
                 wx.CallAfter(self.RefreshProjectTree)