'slot.fileName == nil' not checkt in 'function courseplay.courses:loadCoursesAndFoldersFromXml()'

[MyStripes]

Yesterday I started a new savegame on the map MVP19 (version 1.1.1.1). The loading process took a long time, so i opened the log and there was an error in 'course_management.lua' line 1366. the slot.fileName was nil. I did not investigate the error mutch but I did a workaround with checking slot.fileName for nil with an 'if' and skipping the following commands if so.