lava-dashboard-tool bundles raises python exception

Preconditions:
Bundle stream on LAVA dashboard exists and contains some bundles.

Steps to reproduce:
lava-dashboard-tool bundles --dashboard-url=http://<email address hidden>/path/RPC2/ /bundle/stream/path/

Outcome:
Traceback (most recent call last):
  File "/usr/bin/lava-dashboard-tool", line 9, in <module>
    load_entry_point('lava-dashboard-tool==0.7', 'console_scripts', 'lava-dashboard-tool')()
  File "/usr/lib/python2.7/dist-packages/lava_dashboard_tool/main.py", line 37, in main
    run_with_dispatcher_class(LaunchControlDispatcher)
  File "/usr/lib/python2.7/dist-packages/lava_tool/dispatcher.py", line 45, in run_with_dispatcher_class
    raise cls.run()
  File "/usr/lib/python2.7/dist-packages/lava/tool/dispatcher.py", line 147, in run
    raise SystemExit(cls().dispatch(args))
  File "/usr/lib/python2.7/dist-packages/lava/tool/dispatcher.py", line 137, in dispatch
    return command.invoke()
  File "/usr/lib/python2.7/dist-packages/lava_dashboard_tool/commands.py", line 443, in invoke
    return self.invoke_remote()
  File "/usr/lib/python2.7/dist-packages/lava_dashboard_tool/commands.py", line 628, in invoke_remote
    self.renderer.render(self.server.bundles(self.args.PATHNAME))
  File "/usr/lib/python2.7/dist-packages/lava_dashboard_tool/commands.py", line 303, in render
    self._render_dataset(dataset)
  File "/usr/lib/python2.7/dist-packages/lava_dashboard_tool/commands.py", line 283, in _render_dataset
    dataset, columns, maxlen = self._analyze_dataset(dataset)
  File "/usr/lib/python2.7/dist-packages/lava_dashboard_tool/commands.py", line 180, in _analyze_dataset
    row[column] = self.row_formatter[column](row[column])
  File "/usr/lib/python2.7/dist-packages/lava_dashboard_tool/commands.py", line 613, in <lambda>
    'uploaded_on': lambda x: x.strftime("%Y-%m-%d %H:%M:%S")},
AttributeError: DateTime instance has no attribute 'strftime'