Improve error handling

src/views/contents/ContentList.vue

@@ -26,9 +26,13 @@ const client = useClient();
 const contents = ref();
 
 onBeforeMount(async () => {
+  if (props.creatorId == null) return
+  
   try {
     const response = await client.get(`/api/contents/user/${props.creatorId}`)
-    contents.value = response.data
+    if (response.status >= 200 && response.status < 300) {
+      contents.value = response.data
+    }
   } catch (error) {
     console.error("Failed to fetch posts", error);
   }