make mesh_tags optional
as requested by @giorgiapase: make mesh_tags optional (e.g. when reading in a measurement mesh)
Note: read_mesh
has different types now since it returns tuple[Mesh, MeshTags | None]
instead of tuple[Mesh, MeshTags]
. this will have consequences in nsx
, hyperelastix
, roukf
Edited by D.J. Nolte