Fix centering logic for translations

openscad / MCAD

OpenSCAD Parametric CAD Library (LGPL 2.1)

http://reprap.org/wiki/MCAD

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Closed dyanawu closed 5 years ago

dyanawu commented 5 years ago

len() testing throws a warning in openscad2019 and up. Using the built-in is_bool() instead fixes this.