Re: LTI 1.3 | Cron error

1. I suspect that error is due to a missed update in MDL-74691. Basically, we used to expect a lineitems URL (the plural URL) and that issue should have addressed the error. Looks like I just missed a spot. I'll create an issue for this but it should be a fairly simple fix.
   
2. The score service uses the lineitem URL which is a unique URL for the specific resource's lineitem, and requires userid. Per the spec:
   

The userId identifies the recipient of the Score (usually a student). The userId MUST be present and MUST be the same as the resource link LTI parameter 'user_id'.