Email notify for merge request is missing "updated by user"
Summary
We have modified email template for gitlab CE and we have added "updated_by" informations on them.
But with gitlab 12, in email notification for merge request (new_merge_request_email, reassigned_merge_request_email, closed_merge_request_email, etc ...)
updated_by_user_id is nil or empty.
Steps to reproduce
In file merge_requests.rb, in method 'reassigned_merge_request_email' add @updated_by = User.find(updated_by_user_id)
And in file reassigned_merge_request_email.html.haml add @updated_by.email
What is the current bug behavior?
We have error because updated_by is nil
What is the expected correct behavior?
updated_by should be not nil
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( It is my first issue repporting so be peacefull :) )