fix. [PWT-158] 공식 영상 > 추천 영상 자동 롤링 기능 미동작

layers/templates/GrDetail03/index.vue

@@ -29,15 +29,17 @@ const slideData = computed(() => {
   })
 })
 const thumbnailData = computed(() => {
-  return slideData.value.map(item => item.pagenaviThumbnail?.groups?.[0])
+  return slideData.value
+    .map(item => item?.pagenaviThumbnail?.groups?.[0])
+    .filter((group): group is NonNullable<typeof group> => group != null)
 })
 const paginationData = computed(() => {
   return getComponentGroupAry(props.components, 'pagination')
 })
 
 const videoSrc = (item: PageDataTemplateComponent) => {
-  const src = getComponentGroup(item, 'video')?.res_path
-  return getCurrentSrc(src)
+  const videoData = getComponentGroup(item, 'video')
+  return getCurrentSrc(videoData)
 }
 
 const handleSplideMove = (_splide: SplideType, newIndex: number) => {