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DMPlex CGNS: support high-order viewing without an FE

Jed Brown requested to merge jed/fix-cgns-high-order-no-fe into main

This avoids reducing high-order geometry to linear when no field is present.

$ $PETSC_ARCH/tests/dm/impls/plex/tests/ex33 -dm_plex_simplex 0 -dm_plex_box_faces 1,1 -mesh_transform annulus -dm_coord_space 0 -dm_coord_petscspace_degree 3 -dm_refine 1 -dm_view cgns:test.cgns

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