Enhancement: Form validation when vendor Terms & Conditions content is empty

includes/Dashboard/Templates/Settings.php

@@ -479,6 +479,16 @@
             }
         }
 
+        // Validate Terms & Conditions: if enabled, content must not be empty.
+        $enable_tnc = sanitize_text_field( wp_unslash( $_POST['dokan_store_tnc_enable'] ?? '' ) ) === 'on';
+        if ( $enable_tnc ) {
+            $store_tnc = wp_strip_all_tags( wp_unslash( $_POST['dokan_store_tnc'] ?? '' ) );
+
+            if ( empty( trim( $store_tnc ) ) ) {
+                $error->add( 'dokan_tnc_content', esc_html__( 'Please add Terms & Conditions content before save the settings.', 'dokan-lite' ) );
+            }
+        }
+
         if ( $error->get_error_codes() ) {
             return $error;
         }
@@ -864,7 +874,7 @@
      *
      * @return string
      */
     public function get_method_frontend_title( $title, $method ) {
         if ( 0 === stripos( $title, 'Dokan ' ) ) {
             return substr( $title, 6 );
         }