When logging is set to debug, a workbox Router instance will log when it's asked to handle a request event but there's no handler for that event.

This perhaps makes sense if all you're using is the default router, but if you're using more than one router it starts to get pretty noisy pretty fast. It's also confusing, because you start seeing things like this:

<img width="398" alt="screen s

Here is an issues with detailed description: NekR/offline-plugin#77

In Settings : 'Add a new side account' button

Step #2 in Side account creation

(a very light & quick version of onboarding, with only nickname step)
![side account mode copy](https://user-images.githubusercontent.com/37345040/99953009-dd7db900-2d80-11eb-9f6f-e