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[Expired for cloud-init because there has been no activity for 60 days.]

** Changed in: cloud-init
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1879673

Title:
  KeyError on optional parameters on bridge

Status in cloud-init:
  Expired

Bug description:
  I use NoCloud with network-config-format-v2
  and the following network config according to 
  https://cloudinit.readthedocs.io/en/latest/topics/network-config-format-v2.html#bridges

  /var/lib/cloud/seed/nocloud-net/network-config:
  version: 2
  ethernets:
    eth0:
      match: {name: "eth0"}
    eth1:
      match: {name: "eth1"}
  bridges:
    br0:
      interfaces:  [eth1]

  cloud-init init fails with a Python error:

  2020-05-20 09:53:24,474 - util.py[WARNING]: failed stage init
  failed run of stage init
  ------------------------------------------------------------
  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 708, 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 180, in apply_network_config
      dev_names = self._write_network_config(netconfig)
    File "/usr/lib/python3/dist-packages/cloudinit/distros/debian.py", line 115, in _write_network_config
      return self._supported_write_network_config(netconfig)
    File "/usr/lib/python3/dist-packages/cloudinit/distros/__init__.py", line 95, in _supported_write_network_config
      renderer.render_network_config(network_config)
    File "/usr/lib/python3/dist-packages/cloudinit/net/renderer.py", line 55, in render_network_config
      network_state=parse_net_config_data(network_config),
    File "/usr/lib/python3/dist-packages/cloudinit/net/network_state.py", line 76, in parse_net_config_data
      nsi.parse_config(skip_broken=skip_broken)
    File "/usr/lib/python3/dist-packages/cloudinit/net/network_state.py", line 292, in parse_config
      self.parse_config_v2(skip_broken=skip_broken)
    File "/usr/lib/python3/dist-packages/cloudinit/net/network_state.py", line 323, in parse_config_v2
      handler(self, command)
    File "/usr/lib/python3/dist-packages/cloudinit/net/network_state.py", line 599, in handle_bridges
      self._handle_bond_bridge(command, cmd_type='bridge')
    File "/usr/lib/python3/dist-packages/cloudinit/net/network_state.py", line 728, in _handle_bond_bridge
      params = item_params['parameters']
  KeyError: 'parameters'

  
  It may be fixed by changing:
  https://github.com/canonical/cloud-init/blob/master/cloudinit/net/network_state.py#L728
  to 
     params = item_params.get('parameters', {})
  as the parameters key is optional.

  The workaround is to add an empty
     parameters: {}
  mapping to your bridge

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