diff --git a/.editorconfig b/.editorconfig
index 558350e..a4c715a 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -12,11 +12,8 @@ end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
 indent_style = tab
-tab_width = 4
 
-[*.json]
+[*.{yml,yaml}]
 indent_style = space
-indent_size = 4
+indent_size = 2
 
-[*.md]
-trim_trailing_whitespace = false
diff --git a/includes/Term/UI.php b/includes/Term/UI.php
index 405cd2e..340314d 100644
--- a/includes/Term/UI.php
+++ b/includes/Term/UI.php
@@ -231,14 +231,14 @@ abstract protected function format_output( $value ): string;
 	 *
 	 * @return string|void
 	 */
-	public function add_column_value( string $empty = '', string $custom_column = '', int $term_id = 0 ) {
+	public function add_column_value( string $empty = null, string $custom_column = null, int $term_id = 0 ) {
 		if ( ! filter_input( INPUT_GET, 'taxonomy' ) && ! filter_input( INPUT_POST, 'taxonomy' ) ) {
-			return $empty;
+			return $empty ?? '';
 		}
 
 		// Bail if no taxonomy passed or not on the `meta_key` column.
 		if ( ( $this->meta_key !== $custom_column ) || ! empty( $empty ) ) {
-			return $empty;
+			return $empty ?? '';
 		}
 
 		// Get the metadata.