required = false 인 파라미터 전부 옵셔널 파라미터로 변경

src/main/kotlin/kr/co/vividnext/sodalive/content/series/ContentSeriesController.kt

@@ -18,7 +18,7 @@ class ContentSeriesController(private val service: ContentSeriesService) {
     @GetMapping
     fun getSeriesList(
         @RequestParam creatorId: Long,
-        @RequestParam("sortType", required = false) sortType: SeriesSortType = SeriesSortType.NEWEST,
+        @RequestParam("sortType", required = false) sortType: SeriesSortType? = SeriesSortType.NEWEST,
         @AuthenticationPrincipal(expression = "#this == 'anonymousUser' ? null : member") member: Member?,
         pageable: Pageable
     ) = run {
@@ -27,7 +27,7 @@ class ContentSeriesController(private val service: ContentSeriesService) {
         ApiResponse.ok(
             service.getSeriesList(
                 creatorId = creatorId,
-                sortType = sortType,
+                sortType = sortType ?: SeriesSortType.NEWEST,
                 member = member,
                 offset = pageable.offset,
                 limit = pageable.pageSize.toLong()