Returning empty List instead of raising Exception if response is empty List

[andrei-samofalov]

Hi!
Noticed that when the result of a query to the database gives an empty value validation raises InvalidIterableOfModelsException.
Though it would be better to return just empty list.
What do you think about it?

flask-pydantic/flask_pydantic/core.py

Line 47 in 4b9b7c6

def is_iterable_of_models(content: Any) -> bool:

I can fix this in couple of days