Error\'s aren\'t logged

This issue is imported from pivotal

When an error occurs, the logs only show a \`\`\`WARN\`\`\` with null value.\

```
06:43:58.641 [http-nio-8080-exec-7] DEBUG access.api.InvitationController - /all invitations
07:00:00.013 [scheduling-1] INFO access.cron.ResourceCleaner - Deleted 0 users with no activity in the last 1000 days:
07:00:00.015 [scheduling-1] INFO access.cron.ResourceCleaner - Deleted 0 non-super users with no userRoles;
07:00:00.018 [scheduling-1] INFO access.cron.ResourceCleaner - Deleted 0 userRoles with an endDate in the past: []
07:06:43.301 [http-nio-8080-exec-9] DEBUG access.api.UserController - /config
07:06:43.357 [http-nio-8080-exec-5] WARN access.api.DefaultErrorController - null
```\