Remove debugging code

Author: bdlucas1

mathics/builtin/box/graphics3d.py

@@ -307,7 +307,6 @@ def calc_dimensions(final_pass=True):
                     zmin = elements.translate((0, 0, zmin))[2]
                     zmax = elements.translate((0, 0, zmax))[2]
                 else:
-                    raise
                     raise BoxExpressionError
             except (ValueError, TypeError):
                 raise BoxExpressionError