[metapost] test for empty text?

Colin Fraizer metapost at cfraizer.com
Tue May 28 14:27:38 CEST 2013

Perhaps I am missing something really obvious:


-          Is there a way to test if the replacement text of a macro is


I have a macro which expands to a color or to empty (0 tokens), in which
case I want to use "background". 




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