fix: allow empty field for chained actions fields

includes/admin/feedzy-rss-feeds-actions.php

@@ -154,10 +154,14 @@ public function set_settings( $options ) {
 		/**
 		 * Extract magic tags.
 		 *
-		 * @return string
+		 * @return array|array[]
 		 */
 		public function extract_magic_tags() {
-			preg_match_all( '/\[\[\{(.*)\}\]\]/U', $this->actions, $item_magic_tags, PREG_PATTERN_ORDER );
+			$can_process = preg_match_all( '/\[\[\{(.*)\}\]\]/U', $this->actions, $item_magic_tags, PREG_PATTERN_ORDER );
+			if ( ! $can_process ) {
+				return array();
+			}
+
 			$extract_tags = array();
 			if ( ! empty( $item_magic_tags[0] ) ) {
 				$extract_tags = array_map(
@@ -178,6 +182,10 @@ function( $tag ) {
 		 * Get magic tags.
 		 */
 		public function get_tags() {
+			if ( ! is_array( $this->get_extract_tags() ) ) {
+				return $this->actions;
+			}
+
 			$replace_to   = array_column( $this->get_extract_tags(), 'replace_to' );
 			$replace_with = array_column( $this->get_extract_tags(), 'replace_with' );
 			return str_replace( $replace_to, $replace_with, $this->actions );
@@ -194,6 +202,10 @@ public function get_extract_tags() {
 		 * Get actions.
 		 */
 		public function get_actions() {
+			if ( ! is_array( $this->get_extract_tags() ) ) {
+				return $this->actions;
+			}
+
 			$replace_with = array_column( $this->get_extract_tags(), 'replace_with' );
 			$actions      = array_map(
 				function( $action ) {