fixed crashes on a 32bits target

[0xeb]

PyClassInformer was prematurely crashing, so now we skip empty entries gracefully.

[herosi]

Thanks for the PR!
I'm curious why this occurs. Thie vftable has a valid COL and CHD but BCA is empty?
Can you attach the binary here?

[0xeb]

@herosi , first thank you for your good work and for merging this quick fix.

I am very sorry, I can't share this binary at this time.

But here, I kept getting errors all over the place until my patch:

<error>

---------------------------
Warning
---------------------------
Failed while executing plugin_t.run():
Traceback (most recent call last):
 File "C:/Users/elias/Tools/IDA/plugins/pyclassinformer_plugin.py", line 122, in run
   pci_plugmod_t.run_pci(icon=self.act_icon)
 File "C:/Users/elias/Tools/IDA/plugins/pyclassinformer_plugin.py", line 140, in run_pci
   pyclassinformer.pyclassinformer.run_pci(config=config, icon=icon)
 File "C:\Users/elias/Tools/IDA/plugins\pyclassinformer\pyclassinformer.py", line 27, in run_pci
   pyclassinformer.pci_chooser.show_pci_chooser_t(result, icon=icon, libcolor=lib_func_color, defcolor=gen_func_color)
 File "C:\Users/elias/Tools/IDA/plugins\pyclassinformer\pci_chooser.py", line 110, in show_pci_chooser_t
   c = pci_chooser_t("[PyClassInformer]", data, icon, libcolor, defcolor)
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "C:\Users/elias/Tools/IDA/plugins\pyclassinformer\pci_chooser.py", line 27, in __init__
   self.items = [
                ^
 File "C:\Users/elias/Tools/IDA/plugins\pyclassinformer\pci_chooser.py", line 33, in <listcomp>
   self.get_hierarychy(data, vftable_ea),
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "C:\Users/elias/Tools/IDA/plugins\pyclassinformer\pci_chooser.py", line 47, in get_hierarychy
   bases = u.get_mdisp_bases(col, data)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "C:\Users/elias/Tools/IDA/plugins\pyclassinformer\pci_utils.py", line 201, in get_mdisp_bases
   for path in col.chd.bca.paths[col.offset]:
               ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
KeyError: 144

[herosi]

I understand.
I would be grateful if you pasted the PyClassInformer result related to the offset 0x90 (144) and other relevant results of the multi-inheritance class displayed on the Output window and PyClassInformer widget here?

[herosi]

@0xeb , now I improved to handle complex VI classes in this commit.
038e28e

If you have still any problems, please let me know.
Thank you for your commit and cooperation!
I appreciate it!