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Description of problem:
Udica crashes when processing inspect file without capabilities.

Version-Release number of selected component (if applicable):
udica-0.2.6-3.el9
udica-0.2.6-2.module+el8.6.0+12734+7d3a79c8.noarch

How reproducible:
Try to generate a policy for a container without any capabilities.

Steps to Reproduce:
# podman run docker.io/byte13/b13-k8s-audit-tools:latest
# podman ps -a | grep docker.io/byte13/b13-k8s-audit-tools:latest
<container_ID>  docker.io/byte13/b13-k8s-audit-tools:latest  /bin/sh     9 minutes ago   Exited (0) 9 minutes ago               elegant_archimedes
# podman inspect <container_ID> > i
# grep "EffectiveCaps" i
"EffectiveCaps": null,
# udica -j i test

Actual results:
Traceback (most recent call last):
  File "/usr/local/bin/udica", line 33, in <module>
    sys.exit(load_entry_point('udica==0.2.4', 'console_scripts', 'udica')())
  File "/usr/local/lib/python3.9/site-packages/udica-0.2.4-py3.9.egg/udica/__main__.py", line 216, in main
TypeError: 'NoneType' object is not iterable

Expected results:

Policy test created!

Please load these modules using: 
# semodule -i test.cil /usr/share/udica/templates/base_container.cil


Additional info:
https://github.com/containers/udica/issues/103

https://src.osci.redhat.com/rpms/udica/pull-request/12

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (new packages: udica), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:2305