list index out of range in engine.postprocess

[theheuman]

Inflect pip installed into virtual environment running python3.7 on ubuntu 18.04

After getting an error I wrote some debug statements into inflect.py starting on line 2215:

    def postprocess(self, orig, inflected):
        inflected = str(inflected)

        print("Inflected: " + inflected)
        if "|" in inflected:
            inflected = inflected.split("|")[self.classical_dict["all"]]
        result = inflected.split(" ")

        print("Orig: " + orig)
        print("Inflected: " + inflected)

        # Try to fix word wise capitalization
        for index, word in enumerate(orig.split(" ")):
            ...

My code:

>>> import inflect
>>> p = inflect.engine()
>>> p.classical(all=True)
>>> p.plural("Genie")
Inflected: genies|genii
Orig: Genie
Inflected: genii
'Genii'

>>> p.plural("Master Genie")
Inflected: Master genies|genii
Orig: Master Genie
Inflected: genii

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/omitted/for/privacy/lib/python3.7/site-packages/inflect.py", line 2260, in plural
    or self._plnoun(word, count),
  File "/omitted/for/privacy/lib/python3.7/site-packages/inflect.py", line 2230, in postprocess
    result[index] = result[index].capitalize()
IndexError: list index out of range

So it looks like something went wrong in this line:
inflected = inflected.split("|")[self.classical_dict["all"]]

Instead of returning "master genii" it returns just "genii"

Ninja Edit: This would be occuring on line 2226 in postprocess without the debug statements

[jaraco]

That does seem like a bug. Would you be willing to dig deeper and propose a fix?