dxf import fails in generate_ellipse

Steps to reproduce:

• open Inkscape
• try to open R13_-3d-Line-_Exploded_Meassure.dxf (file taken from inbox#2076 (comment 312931955), saved as R13 dxf file with simple lines and text object only)

What happened?

/usr/lib/python3/dist-packages/apport/report.py:13: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
  import fnmatch, glob, traceback, errno, sys, atexit, locale, imp
Traceback (most recent call last):
  File "dxf_input.py", line 624, in <module>
    DxfInput().run()
  File "/home/nal/all/inkscape/share/inkscape/extensions/inkex/base.py", line 123, in run
    self.save_raw(self.effect())
  File "dxf_input.py", line 613, in effect
    entities[entity]()
  File "dxf_input.py", line 96, in export_POINT
    generate_ellipse(vals[groups['10']][0], vals[groups['20']][0], w / 2, 0.0, 1.0, 0.0, 0.0)
NameError: name 'w' is not defined

Inkscape Version and Operating System:

• 1.1-dev (4e2169377c, 2020-05-06) Linux Mint 19.1 both with extensions synced and at master (cc4bedea and 735dfe3d respectively)

Imports correctly in Inkscape 0.92.5 (fe8e1c6569, 2020-04-22)