Checkmk Werk 7769: Fix broken computation of host contact groups in some cases

ID: 7769 Title: Fix broken computation of host contact groups in some cases Component: Core & setup Level: 2 Class: Bug fix Version: 1.7.0i1 The core config creation was broken in 1.6.0b1 when using the WATO folder hierarchy for assigning contact groups to hosts. An exception like this was displayed after the update or later, e.g. when executing <tt>cmk -U</tt> to update the core configuration: C+: File "/omd/sites/produktiv/lib/python/cmk_base/cee/core_cmc.py", line 457, in cmc_all_hosts cmc_hosts = CMCHosts(config_cache.all_active_hosts(), CMCHostConfig) File "/omd/sites/produktiv/lib/python/cmk_base/cee/core_cmc.py", line 501, in __init__ self._compute(hostnames, host_class) File "/omd/sites/produktiv/lib/python/cmk_base/cee/core_cmc.py", line 513, in _compute host_config = host_class(hostname) File "/omd/sites/produktiv/lib/python/cmk_base/cee/core_cmc.py", line 962, in __init__ super(CMCHostConfig, self).__init__(hostname) File "/omd/sites/produktiv/lib/python/cmk_base/cee/core_cmc.py", line 753, in __init__ self._host_contact_groups = self._host_config.contactgroups File "/omd/sites/produktiv/lib/python/cmk_base/config.py", line 2471, in contactgroups return list(set(cgrs)) TypeError: unhashable type: 'list' C-: