fixes empty trail category in lists

web/src/lib/models/api/trail_schema.ts

@@ -20,7 +20,7 @@ const TrailCreateSchema = z.object({
     thumbnail: z.number().int().nonnegative().optional(),
     waypoints: z.array(z.string()).default([]),
     summit_logs: z.array(z.string()).default([]),
-    category: z.string().length(15).optional(),
+    category: z.string().length(15).optional().or(z.literal('')),
     gpx: z.string().optional(),
     author: z.string().length(15),
 

web/src/routes/lists/edit/[id]/+page.svelte

@@ -94,8 +94,8 @@
         if (
             (data.list?.public === false && $formData.public === true) ||
             ($formData.public === true &&
-                data.list?.expand?.trails?.length !==
-                    $formData.expand?.trails?.length)
+                (data.list?.expand?.trails?.length ?? 0) <
+                    ($formData.expand?.trails?.length ?? 0))
         ) {
             publishConfirmModal.openModal();
             return false;