Allow for empty tab title

[proactivematter]

Is your feature request related to a problem? Please describe.
N/A

Describe the solution you'd like
Currently trying to use an empty character (such as a space) is ignored by Bonjourr. Well, not entirely ignored, I note that trying to use a space will change "New tab" to "New Tab".

Describe alternatives you've considered
I have tried sooo many unicode empty characters to see if any would be supported, but it's not possible.

[victrme]

It looks like it's not possible to have an empty tab title because the browser will override the white space with its default text.

We might be able to trick the browser with a really small character, but for now I'll label the issue as "not possible" 😢