khelpcenter shows blank page instead of ScrollKeeper results

[Norbert]

Steps to reproduce:
1. Install KHelpCenter
2. Open KHelpCenter
3. Navigate to ScrollKeeper

Expected results:
* KHelpCenter show ScrollKeeper pages

Actual results:
* KHelpCenter renders empty page

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: khelpcenter 4:5.5.5-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-130.156-generic 4.4.134
Uname: Linux 4.4.0-130-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: MATE
Date: Tue Jul 24 14:45:29 2018
InstallationDate: Installed on 2018-01-04 (200 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: khelpcenter
UpgradeStatus: No upgrade log present (probably fresh install)