[texhax] if condition: is macro body empty?

[Susan Dittmar]

Many thanks to daleif and Phil!
I'll use daleif's version as I got that to work in my case. I guess I would
just have to dig a bit deeper to use your version, Phil, but as I said time
is pressing. I'll leave digging into it until I next need a construct
as that one.

Again, lots of thanks!

	Susan
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