After merging PR #15355 we found that CircleCI may send
super minimal payloads. This does not seem to depend on
.circleci/config.yml since we received two different
types of payloads off of the same configuration.
Signed-off-by: Hemanth V. Alluri <hdrive1999@gmail.com>
All webhook fixtures in zerver/fixtures/<webhook_name> have now
been moved to dedicated webhook-specific directories under
zerver/webhooks/<webhook_name>/fixtures, where <webhook_name> is
the name of the webhook.