gnome-software cannot find libreoffice-base when libreoffice-writer requests to install it

[Amr Ibrahim]

Steps:
1. Make sure LibreOffice Base is not installed
2. Start LibreOffice Writer
2. Choose Tools -> Bibliography Database
3. Writer asks to install missing software
4. Click on the notification

Expected results:
gnome-software finds libreoffice-base and able to install it

Actual result:
gnome-software fails to find the missing software

See the attached screencast.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-software 3.28.1-0ubuntu4.18.04.4
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 22 17:50:55 2019
InstallationDate: Installed on 2018-11-29 (53 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
InstalledPlugins:
 gnome-software-plugin-flatpak N/A
 gnome-software-plugin-limba N/A
 gnome-software-plugin-snap 3.28.1-0ubuntu4.18.04.4
SourcePackage: gnome-software
UpgradeStatus: No upgrade log present (probably fresh install)