[bugfix] Fix error when cache associativity information is not available by sysctl
#2206
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Closes #2202 .
In the sysctl output from @rsarm's laptop I could not find the information for the cache associativity. So in order to fix the bug in the unittest I made the
sysctlcommand more generic (to avoid theSpawnedProcessErrorexception).We don't give a warning for every item of the processor information that we cannot detect because it would unnecessarily complicate the
--detect-host-topologyoption, since it's supposed to print only the json object.