After the changes in #25572, users were no longer able to start a direct
message with bots if the organization disabled direct messages. However,
we should allow direct messages to bots regardless of the policy because
it's a useful interface for users to interact with various classes of
bots.
user_ids_string_to_ids_array was also modified to prevent cases where
the split function returned an array of [0] rather than [] when dealing
with a empty id string of "".
Fixes: #21896.
`get_users_from_ids` is a function that map an array of user ids to
`User` object. According to `get_by_user_id` for mapping, every
id should be mapped to a valid `User` object. Thus removed
`undefined` annotation in this commit.
We use `get_by_user_id` instead of directly accessing the global dict, because
when accessing person objects directly from one of the global dicts we
need callers to check for undefined values, this can be fixed by using
`get_by_user_id` method to get person objects because that functions
makes sure to assert that we indeed have a valid user id, so it will
never return undefined values.
Co-authored-by: Zixuan James Li <p359101898@gmail.com>
Joelute
evykassirer
Junyao Chen
Lalit Singh
Lalit