Invitee email can be None which break the Ftrack commit.

pype/modules/ftrack/actions/action_clone_review_session.py

@@ -16,11 +16,14 @@ def clone_review_session(session, entity):
 
  # Add all invitees.
  for invitee in entity["review_session_invitees"]:
+ email = invitee["email"]
+ if email is None:
+ email = ""
  session.create(
  "ReviewSessionInvitee",
  {
  "name": invitee["name"],
- "email": invitee["email"],
+ "email": email,
  "review_session": review_session
  }
  )