Checkmk Werk 8856: Fix autocheck conversion of old if64 checks

ID: 8856 Title: Fix autocheck conversion of old if64 checks Component: Core & setup Level: 1 Class: Bug fix Version: 1.7.0i1 When a site used very old autocheck files which were created with Checkmk older than 1.2.x, this resulted in an exception during the autochecks conversion which is now automatically performed during "omd update" procedure. These autochecks are now also converted seamlessly.