find_or_create doesn't create if any field in the path is null

[shreyanshsaha]

Request: I would like find_or_create to create the child paths if any of the fields in the path is null

Consider this code snippet

from jsonpath_ng.ext import parse

data = {"folder": {"document": None}}
expr = parse('$.folder.document.doc_a.value')

print(expr.find_or_create(data))
print(f"After find_or_create: {data}")

Current Output

[]
After find_or_create: {'folder': {'document': None}}

Expected Output

[DatumInContext(value={}, path=Fields('value'), context=DatumInContext(value={'value': {}}, path=Fields('doc_a'), context=DatumInContext(value={'doc_a': {'value': {}}}, path=Fields('document'), context=DatumInContext(value={'document': {'doc_a': {'value': {}}}}, path=Fields('folder'), context=DatumInContext(value={'folder': {'document': {'doc_a': {'value': {}}}}}, path=Root(), context=None)))))]
After find_or_create: {'folder': {'document': {'doc_a': {'value': {}}}}}

i.e., find_or_create creates doc_a for None docuement field

It seems to be an intentional behavior. Please let me know if i missed anything here.