Pathologic was missing because of a .git folder inside.

[yaffs-website] / web / modules / contrib / front / composer.json

{
  "name": "front/front",
  "type": "drupal-module",
  "description": "Provides configurable front page",
  "homepage": "http://drupal.org/project/front",
  "license": "GPL-2.0+",
  "require": {
    "drupal/core": "~8.1"
  }
}