fix null program_num_required_courses on mitxonline series program #962
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What are the relevant tickets?
#961
Description (What does it do?)
Fixing bug on nulls when doing math on addition: 1 + NULL = NULL, which resulted null in program_num_required_courses for programs that only contain required courses. e.g. program_id=4,5,6,7,8,9
This bug also blocked a few downstream models (e.g. int__mitxonline__courserunenrollments) from being updated due to test failure.
How can this be tested?
test should pass
should have correct required course populated