Fix: pubs with no discussions

[gabestein]

Issue(s) Resolved

Fixes three errors:

1. Where we would send a bad query if a legacy pub had no discussions.
2. Where we assumed a discussion always had a comment.author, but in cases with anonymous comments it has a comment.commenter.
3. We were passing in an undefined ORCID url even if the user didn't have an ORCID

Test Plan

Discussions Issue

• Import a pub with no discussions and make sure versions show up
• Import a pub with discussions and make sure they show up
• Repeat both and make sure both work as expected.

Comments and ORCID Issue

• Import a pub with anonymous comment.commenter discussions.
• Make sure it loads
• Make sure any users with ORCIDs and avatars have them passed in

Screenshots (if applicable)

Notes

[isTravis]

💯 I bumped into that commenter issue on some of the legacy processing earlier - I should've thought of that and mentioned it when we first saw this hiccup. Nice catch!