[BUG] `epicli apply` fails if there is no k8s component enabled

[przemyslavic]

Describe the bug epicli apply command fails with the following error if there is no kubernetes_master component enabled:

12:06:43 ERROR epicli - 'NoneType' object is not subscriptable
Traceback (most recent call last):
  File "/epicli/cli/epicli.py", line 128, in main
    return args.func(args)
  File "/epicli/cli/epicli.py", line 226, in run_apply
    return cmd.apply()
  File "/epicli/cli/src/commands/Apply.py", line 135, in apply
    self.collect_infrastructure_config()
  File "/epicli/cli/src/commands/Apply.py", line 113, in collect_infrastructure_config
    self.output_mhandler.update_doc(config_collector.run())  # update kubernetes config doc
  File "/epicli/cli/src/schema/ManifestHandler.py", line 77, in update_doc
    docs = self.__docs[doc['kind']]  # defaultdict will not raise an error
TypeError: 'NoneType' object is not subscriptable

This bug has been recently introduced in PR #3268.

How to reproduce Steps to reproduce the behavior:

1. Execute epicli apply to deploy any cluster without k8s.

Expected behavior The installation should be successful.

Environment

• Cloud provider: [all]
• OS: [all]

epicli version: [2.0.2dev]

Additional context Add any other context about the problem here.

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DoD checklist

• Changelog
  • [ ] updated
  • [x] not needed
• COMPONENTS.md
  • [ ] updated
  • [x] not needed
• Schema
  • [ ] updated
  • [x] not needed
• Backport tasks
  • [ ] created
  • [x] not needed
• Documentation
  • [ ] added
  • [ ] updated
  • [x] not needed
• [ ] Feature has automated tests
• [ ] Automated tests passed (QA pipelines)
  • [x] apply
  • [ ] upgrade
  • [ ] backup/restore
• [x] Idempotency tested
• [x] All conversations in PR resolved