Fix post() for category deleting

Prinsipnya kan categori yang memiliki post baik itu publik atau draf harusnya tidak bisa dihapus. pada template view sudah dibatasi demikian, namun ketika saya mencoba secara langsung melalui link `/category/nama_category/delete` bisa terhapus meski category tersebut memiliki postingan.
Dengan fix ini maka hal itu tidak akan terjadi.

system/htmly.php

@@ -1903,12 +1903,35 @@ get('/category/:category/delete', function ($category) {
 });
 
 // Get deleted category data
-post('/category/:category/delete', function () {
+post('/category/:category/delete', function ($category)
+{
     $proper = is_csrf_proper(from($_REQUEST, 'csrf_token'));
-    if ($proper && login()) {
+    if ($proper && login())
+    {
+        $desc = get_category_info($category);
+        if (strtolower($category) !== 'uncategorized')
+        {
+            $desc = $desc[0];
+        }
         $file = from($_REQUEST, 'file');
         $destination = from($_GET, 'destination');
-        delete_page($file, $destination);
+        if (get_categorycount($desc->md) == 0 && get_draftcount($desc->md) == 0)
+        {
+            delete_page($file, $destination);
+        }
+        else
+        {
+            if ($destination == 'post')
+            {
+                $redirect = site_url();
+                header("Location: $redirect");
+            }
+            else
+            {
+                $redirect = site_url() . $destination;
+                header("Location: $redirect");
+            }
+        }
     }
 });