Werk #15608: Show explanation message instead of KeyError: 'extensions'

Component	Dynamic host configuration
Title	Show explanation message instead of KeyError: 'extensions'
Date	Apr 27, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0b7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p28 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Previously, if a folder is moved or deleted, which is in use by a DCD connection, the following error was shown.

09:37:31 ERROR An exception occured
Traceback (most recent call last):
  File "/omd/sites/heute/lib/python3/cmk/cee/dcd/connectors/piggyback.py", line 260, in _execute_phase2
    created_host_names = self._create_new_hosts(hosts_to_create)
  File "/omd/sites/heute/lib/python3/cmk/cee/dcd/connectors/piggyback.py", line 479, in _create_new_hosts
    created_host_names = self._create_piggyback_hosts(hosts_to_create)
  File "/omd/sites/heute/lib/python3/cmk/cee/dcd/connectors/piggyback.py", line 504, in _create_piggyback_hosts
    assert_never(result)
  File "/omd/sites/heute/lib/python3.11/typing.py", line 2462, in assert_never
    raise AssertionError(f"Expected code to be unreachable, but got: {value}")
AssertionError: Expected code to be unreachable, but got: None

With this Werk, a debugging message will be shown instead.

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