Fatal Error in "Search Builder" if "Household" Contact type is disabled.
On upgrading to CiviCRM 5.17.0 we noticed that a Fatal Error was thrown when accessing "Search Builder", relating to Null values in arrays in CRM/Core/BAO/Map.php.
We tracked the issue down to the "Household" contact type, which we had disabled for the two client sites throwing these errors (these two clients never use Household contact type, so we'd used CiviAPI to disable this contact type).
When we re-enabled Household contact type the Fatal error was resolved.
It feels like the Search Builder shouldn't break when Household contact type is disabled, so logging this for a fix.