Option to remove empty attributes

[martinstender]

Hi all,

Unless I have overlooked a configuration possibility, it would be really nice to globally get rid of empty attributes. And maybe trim the strings inside attributes as well, but that's minor.
You could say that we could/should wrap everything in null/empty-checks, but it's of course a lot quicker to just add a class-variable to an element, without having to take into account, that some logic somewhere earlier have decided that there isn't a need for a specific css-class or something like that.

Any suggestions? TIA 😊