Creation of `elliptic_cylinder` mesh fails

[andrea-petrocchi]

mammos-mumag-matrixfree/src/mesh.py

Lines 485 to 491 in 4c2bc78

	tet_build(
	mi,
	options=opts,
	attributes=True,
	volume_constraints=True,
	verbose=bool(verbose),
	)

The output from tet_build is not stored (and the npz mesh is not returned).