Allow dots as input

[Empty2k12]

On my Courier tour I had people trying to input a dot. You have voiced concerns over dots as signatures.

A easy fix would be setting a min amount of PathDescriptior actions.

This way people trying to sign with "T. Test" or with names containing ÖÄÜ will be able to sign.

[taig]

Yes, it would be nice if it was possible to draw and render a dot. The isEmpty method currently checks (afaik) if at least one line is in the path, which is probably already the behavior we want.