Post save CourseRunCertificate signal doesn't work

[annagav]

The program certificates don't get created for DEDP (maybe other programs too) as a result of a post_save signal from CourseRunCertificate.
Related issue https://github.com/mitodl/hq/issues/5287

Expected Behavior

Program certificates should get generated automatically for all live programs.

Current Behavior

Users not getting their program certificates.

Steps to Reproduce

Get certificates for all course requirements in the program. On creation the signal should call generate_program_certificate, but it doesn't.

[pdpinch]

Can signals log errors?

[annagav]

Yes, I can have a signal log something, but not if it never gets called.

I played around with this and it looks like when I manually import the signal in the django shell then it seems to work fine.