intelmqctl: Starting groups raises exception

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On branch maintenance (and develop):

intelmq@localhost:~> intelmqctl start --group experts
Starting Expert group...
Traceback (most recent call last):
  File "/usr/local/bin/intelmqctl", line 33, in <module>
    sys.exit(load_entry_point('intelmq', 'console_scripts', 'intelmqctl')())
  File "/dev/intelmq/intelmq/bin/intelmqctl.py", line 1909, in main
    return x.run()
  File "/dev/intelmq/intelmq/bin/intelmqctl.py", line 1048, in run
    retval, results = args.func(**args_dict)
  File "/dev/intelmq/intelmq/bin/intelmqctl.py", line 1064, in bot_start
    return self.botnet_start(group=group)
  File "/dev/intelmq/intelmq/bin/intelmqctl.py", line 1152, in botnet_start
    bots = self._configured_bots_list(group=group)
  File "/dev/intelmq/intelmq/bin/intelmqctl.py", line 1141, in _configured_bots_list
    bots = sorted(k_v[0] for k_v in filter(lambda x: x[1]["group"] == BOT_GROUP[group], self.runtime_configuration.items()))
  File "/dev/intelmq/intelmq/bin/intelmqctl.py", line 1141, in <genexpr>
    bots = sorted(k_v[0] for k_v in filter(lambda x: x[1]["group"] == BOT_GROUP[group], self.runtime_configuration.items()))
  File "/dev/intelmq/intelmq/bin/intelmqctl.py", line 1141, in <lambda>
    bots = sorted(k_v[0] for k_v in filter(lambda x: x[1]["group"] == BOT_GROUP[group], self.runtime_configuration.items()))
KeyError: 'group'

The "global" block has no group and needs to be skipped here.