Fix/issue 36360 (#37883)

plugins/woocommerce/changelog/fix-issue-36360

@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Remove the default text in "Additional content" being sent for all emails when the field is empty for Admin New Order email

plugins/woocommerce/includes/emails/class-wc-email-new-order.php

@@ -165,6 +165,23 @@ if ( ! class_exists( 'WC_Email_New_Order' ) ) :
 			return __( 'Congratulations on the sale.', 'woocommerce' );
 		}
 
+		/**
+		 * Return content from the additional_content field.
+		 *
+		 * Displayed above the footer.
+		 *
+		 * @since 3.7.0
+		 * @return string
+		 */
+		public function get_additional_content() {
+			/**
+			 * This filter is documented in ./class-wc-email.php
+			 *
+			 * @since 7.8.0
+			 */
+			return apply_filters( 'woocommerce_email_additional_content_' . $this->id, $this->format_string( $this->get_option( 'additional_content' ) ), $this->object, $this );
+		}
+
 		/**
 		 * Initialise settings form fields.
 		 */

plugins/woocommerce/includes/emails/class-wc-email.php

@@ -400,6 +400,15 @@ class WC_Email extends WC_Settings_API {
 	 * @return string
 	 */
 	public function get_additional_content() {
+		/**
+		 * Provides an opportunity to inspect and modify additional content for the email.
+		 *
+		 * @since 3.7.0
+		 *
+		 * @param string      $additional_content Additional content to be added to the email.
+		 * @param object|bool $object             The object (ie, product or order) this email relates to, if any.
+		 * @param WC_Email    $email              WC_Email instance managing the email.
+		 */
 		return apply_filters( 'woocommerce_email_additional_content_' . $this->id, $this->format_string( $this->get_option( 'additional_content', $this->get_default_additional_content() ) ), $this->object, $this );
 	}