[Merge] lp:~ahayzen/webbrowser-app/migrate-to-tabs-component into lp:webbrowser-app/staging

[Olivier Tilloy]

Review: Needs Fixing

When closing a tab, I’m seeing the following warning:

TabsBar.qml:57: TypeError: Cannot read property 'localIcon' of undefined
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https://code.launchpad.net/~ahayzen/webbrowser-app/migrate-to-tabs-component/+merge/312340
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