Diogo Peralta Cordeiro

Oh, someone had already opened an issue about it... Sorry, I [opened a MR](https://github.com/klaussinani/awesome-prolog/pull/14) on that without first checking the issues :(

@klaussinani I believe this issue can be closed now as the related MR was accepted...

GNU social is also looking for help to improve their (already mostly working) ActivityPub plugin: https://www.diogo.site/projects/GNU-social/soc/2019/#todo-finish-ap-plugin

Oh... Is there any setting to set the fallback to something like `null` representing the absence of value? Otherwise it can be complicated to distinguish between actual findings and this...

Rebased and fixed the issue found by psalm.