fixed bug when call list.delete('all') for empty list #69
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self.list.delete('all')
File "/home/usr/prj/venv/lib/python3.10/site-packages/CTkListbox/ctk_listbox.py", line 260, in delete
self.deactivate("all")
File "/home/usr/prj/venv/lib/python3.10/site-packages/CTkListbox/ctk_listbox.py", line 188, in deactivate
self.deselect(0)
File "/home/usr/prj/venv/lib/python3.10/site-packages/CTkListbox/ctk_listbox.py", line 178, in deselect
if self.buttons[index] in self.selections:
KeyError: 0