Error on approved refund request when empty Commission _dokan_additio…

…nal_fee #4018 (#2485)

* fix: fetal error when admin commission additional fee is empty

* update: convert empty string to float procedure

* update: hpos enabled check remove & $item_total less than 0

* update : false check item_total value

includes/Commission/Settings/OrderItem.php

@@ -62,16 +62,14 @@ public function get(): Setting {
          */
         $order_id = wc_get_order_id_by_order_item_id( $this->order_item_id );
 
-        if ( $order_id && OrderUtil::is_hpos_enabled() ) {
+        if ( $order_id ) {
             $order = dokan()->order->get( $order_id );
-            $item_total = $order->get_meta( '_dokan_item_total' );
-        } else {
-            $item_total = get_post_meta( $order_id, '_dokan_item_total', true );
+            $item_total = floatval( $order->get_meta( '_dokan_item_total' ) );
         }
 
         $product_price = (float) wc_format_decimal( $this->product_price_to_calculate_commission );
         if ( $order_id && $item_total ) {
-            $additional_flat = ( $additional_flat / $item_total ) * $product_price;
+            $additional_flat = ( floatval( $additional_flat ) / $item_total ) * $product_price;
         }
 
         $settings = new Setting();