[#51]: whPullReqTargetRepo can be null

[kvanbere]

Issue reference:
#51.

Submission Checklist:

• Have you followed the guidelines in our Contributing document (for example, is your tree a clean merge)?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Does your submission build?
• Does your submission pass tests?
• Have you run lints on your code locally prior to submission?
• Have you updated all of the cabal/nix infrastructure?
• Is this a breaking change? Have you discussed this?

[kvanbere]

@roberth shall I add you to AUTHORS ?

[roberth]

Sure! The more the merrier.

[kvanbere]

Ugh, the merge with squash erased the authorship from 9a78a65. Surely that's not normal, otherwise it's a useless feature.

[roberth]

In my experience, git and github work best with merges.

Don't worry about fixing it up.

[kvanbere]

This has been released, thanks @roberth!