Error when pushing on a new branch

[fletort]

If a push to a new branch (to create it on the receiver) :

File "/srv/git/repositories/sandbox.git/hooks/post_receive_email.py", line 166, in main
post_receive(mailer, config[EMAILPREFIX], config[SMTP_SUBJECT])
File "/srv/git/repositories/sandbox.git/hooks/post_receive_email.py", line 134, in post_receive
process_commits(commits, mailer, subject_prefix, subject_template)
File "/srv/git/repositories/sandbox.git/hooks/post_receive_email.py", line 114, in process_commits
assert match
AssertionError