[SGG] Let group tags be undefined in formatting

Author: santeri0200

services/frontend/src/components/StudyGuidanceGroups/format/GeneralTab.ts

@@ -28,8 +28,8 @@ export const useColumns = ({ group }: { group: GroupsWithTags }): [string[], str
   const { isAdmin } = useGetAuthorizedUserQuery()
   const { visible: namesVisible } = useStudentNameVisibility()
 
-  const [programme, combinedProgramme] = group.tags.studyProgramme?.split('+') ?? []
-  const { year } = group.tags
+  const { year, studyProgramme } = group?.tags
+  const [programme, combinedProgramme] = studyProgramme?.split('+') ?? []
 
   const nameColumns = namesVisible ? ['lastName', 'firstNames'] : []
 
@@ -85,14 +85,14 @@ export const useFormat = ({
   filteredStudents: FormattedStudent[]
   includePrimaryProgramme: boolean
 }) => {
-  const [programme, combinedProgramme] = group.tags.studyProgramme?.split('+') ?? []
+  const [programme, combinedProgramme] = group.tags?.studyProgramme?.split('+') ?? []
   const { getTextIn } = useLanguage()
 
   const { isAdmin } = useGetAuthorizedUserQuery()
   const creditDateFilterOptions = useGetCreditDateFilterOptions()
 
   const { data: programmes, isSuccess: programmesSuccess } = useGetProgrammesQuery()
-  const { data: semesters, isSuccess: semestersSuccess } = useGetRelevantSemesterData(Number(group.tags.year))
+  const { data: semesters, isSuccess: semestersSuccess } = useGetRelevantSemesterData(Number(group.tags?.year))
 
   const { currentSemester, allSemesters, firstSemester, lastSemester } = semestersSuccess
     ? semesters