Eeshan Garg 998437c123 check_message: Support sending stream messages by ID. ...

This commit also contains the following auxiliary changes:
* Adds a custom exception, StreamWithIDDoesNotExist for when
  a stream with a given ID does not exist because the error
  message returned by StreamDoesNotExist only makes with stream
  names, not IDs.
* Adds a new helper, get_stream_by_id_in_realm, which is similar
  to get_user_profile_by_id_in_realm (introduced in #10391).
* Adds a helper, validate_stream_id_with_pm_notification, which
  returns the Stream object associated with a given ID and also
  handles PM notifications to the bot owner if the message was
  sent by a bot and if the stream does not exist or has no
  subscribers.
* Modifies the message sent by send_pm_if_empty_stream to
  accommodate stream IDs.

Note that all of the above changes are required before check_message
can be modified to support stream IDs.

2019-01-31 12:43:38 -08:00

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