I’ve switched to a different approach now. But in principle, the problem is 
that I always target both LaTeX and HTML. With the latter, I don’t want to 
have the empty braces.

Example:

INPUT: foo\bar{}baz
AST: [Para [Str "foo",RawInline (Format "tex") "\\bar",Str "{}baz"]]

Here, I can’t use my own Lua filter to implement \bar{} for HTML, because 
that filter will miss the empty braces.

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