c5601a749e
if a pull request's cover letter is empty, `pr.body` is None. in that case we should not try to pass it to `re.findall()` as the "string" parameter. otherwise, we'd get ``` TypeError: expected string or bytes-like object, got 'NoneType' ``` so, in this change, we just return an empty list if the PR in question has an empty cover letter. Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#18125