Try to ensure that entities get a reasonable (i.e. non-zero) Z scale. #1429
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While LibreCAD ignores Z scale on input, generating DXF with entities that has a Z scale of zero creates problems for others.
FreeCAD will for instance choke, see https://tracker.freecadweb.org/view.php?id=4791
An alternative way of dealing with this would be omitting writing Z scales (record 43) to the DXF in the first place.
This is a proposed fix for #1428