Unable to define empty containers init_opts in site configuration

[rezib]

Defining empty containers init_opts in site configuration file:

# cat /etc/fatbuildr/fatbuildr.ini 
[containers]
init_opts =
opts = --resolv-conf=replace-host --quiet --register=no --keep-unit

Results in the following error in fatbuildrd logs:

systemd[1]: Started fatbuildrd.service - Fatbuildr build daemon.
fatbuildrd[15165]: server: [INFO] Saving queue state on disk
fatbuildrd[15165]: worker-devs: [INFO] Picking up task da3214ca-5fa6-4532-ba4c-eb2b233e6018 from queue
fatbuildrd[15165]: worker-devs: [INFO] Task da3214ca-5fa6-4532-ba4c-eb2b233e6018 removed from queue
fatbuildrd[15165]: worker-devs: [INFO] Running task da3214ca-5fa6-4532-ba4c-eb2b233e6018
fatbuildrd[15165]: worker-devs: [INFO] Creating task directory /var/lib/fatbuildr/workspaces/devs/da3214ca-5fa6-4532-ba4c-eb2b233e6018
fatbuildrd[15165]: server: [INFO] Image build environment creation task da3214ca-5fa6-4532-ba4c-eb2b233e6018 submitted in queue
fatbuildrd[15165]: worker-devs: [INFO] Running image build environment creation task da3214ca-5fa6-4532-ba4c-eb2b233e6018
fatbuildrd[15165]: worker-devs: [INFO] Creating build environment bullseye for architecture x86_64 in deb image
fatbuildrd[15165]: Exception in thread worker-devs:
fatbuildrd[15165]: Traceback (most recent call last):
fatbuildrd[15165]:   File "/usr/lib/python3.11/threading.py", line 1038, in _bootstrap_inner
fatbuildrd[15165]:     self.run()
fatbuildrd[15165]:   File "/usr/lib/python3.11/threading.py", line 975, in run
fatbuildrd[15165]:     self._target(*self._args, **self._kwargs)
fatbuildrd[15165]:   File "/usr/lib/python3/dist-packages/fatbuildr/cli/fatbuildrd.py", line 133, in _worker
fatbuildrd[15165]:     instance.tasks_mgr.run(task)
fatbuildrd[15165]:   File "/usr/lib/python3/dist-packages/fatbuildr/tasks/manager.py", line 178, in run
fatbuildrd[15165]:     task.run()
fatbuildrd[15165]:   File "/usr/lib/python3/dist-packages/fatbuildr/tasks/images.py", line 118, in run
fatbuildrd[15165]:     build_env.create(self)
fatbuildrd[15165]:   File "/usr/lib/python3/dist-packages/fatbuildr/images.py", line 232, in create
fatbuildrd[15165]:     task.cruncmd(self.image, cmd, init=True, asroot=asroot)
fatbuildrd[15165]:   File "/usr/lib/python3/dist-packages/fatbuildr/tasks/__init__.py", line 340, in cruncmd
fatbuildrd[15165]:     self.instance.crun(image, cmd, init=init, io=self.io, **kwargs)
fatbuildrd[15165]:   File "/usr/lib/python3/dist-packages/fatbuildr/containers.py", line 78, in __call__
fatbuildrd[15165]:     _cmd.extend(self.conf.containers.init_opts)
fatbuildrd[15165]: TypeError: 'NoneType' object is not iterable
fatbuildrd[15165]: dispatch-da3214ca-5fa6-4532-ba4c-eb2b233e6018: [INFO] Replaying journal for new incoming connection