Since the initialization of parameters is being done incorrectly for
Koha::RecordProcessor, the question in my mind is: Do I tweak the Null filter to
have an initialize method to be triggered for testing, or do I write a new
filter for this regression test? Feedback appreciated. See Bug 15777.
https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=15777