Don't create multiple in-process backend instances
Summary:
The 'name' argument is in most cases empty by which the caller indicates that
they want the default backend. As such repeated calls to loadBackendInProcess(QString())
cause to instantiate a new backend every time, because the name check in the
condition is never true.
Reviewers: sebas, davidedmundson
Reviewed By: davidedmundson
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D9905