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From: Peter Rolf <indiego@gmx.net>
Newsgroups: gmane.comp.tex.context
Subject: 'empty string' test in MP
Date: Tue, 29 Nov 2005 22:26:53 +0100
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Hi all,

I pass a string to a MP graphic using \setMPtext{LABEL}{TEXT}. The
string can also be empty, and then no action (for the text) is taken.
How can I test in MP, if the given \MPstring{LABEL} is empty?

I have tried everything I can imagine in the last one hour, but no
success. Not my day...

This is the old, not working version

if not(\MPstring{LABEL}="") : % is always true.


Peter