Less segfaulty PageRouterAttached
Summary:
- PageRouterAttached will have its router set when the PageRouter creates an object for a route instead of relying on tree climbing
- All PageRouterAttached methods now check for null
Test Plan: make test
Reviewers: Kirigami, mart
Reviewed By: Kirigami, mart
Subscribers: plasma-devel
Tags: Kirigami
Differential Revision: https://phabricator.kde.org/D29262