Check_MK Werk 6350: Fixed broken checking of unrelated hosts when using manual checks

ID: 6350 Title: Fixed broken checking of unrelated hosts when using manual checks Component: Core & setup Level: 1 Class: Bug fix Version: 1.6.0i1 When using the Check_MK Raw Edition it could happen that configuring manual checks for a host broke the check execution of unrelated hosts. The configuration of the manual check of all hosts was loaded into the context of such an unrelated host. Because a host only loads the check definitions of the checks it needs during checking, those manual check configurations were trying to access unavailable data. This lead to a crash and a "(null)" output shown for the "Check_MK" service.