Public bug reported:

root@e1:~# cat /var/lib/cloud/seed/nocloud-net/network-config 
version: 1
config: []

This causes this stacktrace:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 653, in 
status_wrapper
    ret = functor(name, args)
  File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 362, in 
main_init
    init.apply_network_config(bring_up=bool(mode != sources.DSMODE_LOCAL))
  File "/usr/lib/python3/dist-packages/cloudinit/stages.py", line 706, in 
apply_network_config
    return self.distro.apply_network_config(netcfg, bring_up=bring_up)
  File "/usr/lib/python3/dist-packages/cloudinit/distros/__init__.py", line 
178, in apply_network_config
    dev_names = self._write_network_config(netconfig)
  File "/usr/lib/python3/dist-packages/cloudinit/distros/debian.py", line 114, 
in _write_network_config
    return self._supported_write_network_config(netconfig)
  File "/usr/lib/python3/dist-packages/cloudinit/distros/__init__.py", line 93, 
in _supported_write_network_config
    renderer.render_network_config(network_config)
  File "/usr/lib/python3/dist-packages/cloudinit/net/renderer.py", line 56, in 
render_network_config
    templates=templates, target=target)
  File "/usr/lib/python3/dist-packages/cloudinit/net/netplan.py", line 202, in 
render_network_state
    content = self._render_content(network_state)
  File "/usr/lib/python3/dist-packages/cloudinit/net/netplan.py", line 236, in 
_render_content
    if network_state.version == 2:
AttributeError: 'NoneType' object has no attribute 'version'

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: cloud-init 19.2-36-g059d049c-0ubuntu3
ProcVersionSignature: Ubuntu 4.15.0-64.73~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-64-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
Date: Wed Nov 13 21:44:48 2019
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=C.UTF-8
SourcePackage: cloud-init
UpgradeStatus: No upgrade log present (probably fresh install)
cloud-init-log-warnings:
 2019-11-13 21:39:21,144 - util.py[WARNING]: failed stage init-local
 AttributeError: 'NoneType' object has no attribute 'version'
user_data.txt:
 #cloud-config
 manage_etc_hosts: localhost
 ssh_authorized_keys:
 - ssh-rsa 
AAAAB3NzaC1yc2EAAAADAQABAAABAQDeShzUvzOCPWKyfRt0IsiO4//nyDwe6JgL0ZTHO+Wq1nRsuwysdoX9sAMlhAdgx3q6qbJu6Xa3ug1c4rqyszBBovsoOieF4ZzZzrPV4ekzzAaPB5jqCIRostiIimTnxOrnyRtdZ0F81q1jzL9SfyzlzhIVYvdcleEE8c2ziaNZfAeL/cD9MB9jCcxRTNuMQw27QE2yQ4na2YAm3tB0l6vDfiLIx9hstgwyj13I5VsFcoHNohyN0R+Fq6/Zz5rOHiUieiMcs0+b/khnfYKuqygQRpPWAl35OVJUSUgVnbRQsM9TstOfy5IxFxI5oBtueVX1ZUp/xibsZo/1V3dJkKet
 rharper@brettanomyces

** Affects: cloud-init (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug eoan uec-images

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https://bugs.launchpad.net/bugs/1852496

Title:
  nocloud network-config mishandles empty config

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