Fix WP_List_Table::row_actions throwing TypeError when non-countable $actions is passed

Author: m1r0

src/wp-admin/includes/class-wp-list-table.php

@@ -658,7 +658,7 @@ public function current_action() {
 	 * @return string The HTML for the row actions.
 	 */
 	protected function row_actions( $actions, $always_visible = false ) {
-		$action_count = count( $actions );
+		$action_count = is_countable( $actions ) ? count( $actions ) : 0;
 
 		if ( ! $action_count ) {
 			return '';

tests/phpunit/tests/admin/wpListTable.php

@@ -584,4 +584,21 @@ public function test_search_box_works_with_orderby_string() {
 
 		$this->assertStringContainsString( $expected_html, $actual );
 	}
+
+	/**
+	 * Tests that `WP_List_Table::row_actions()` is returning an empty string
+	 * and not throwing a TypeError when a non-countable `$actions` param is passed.
+	 *
+	 * @ticket 58789
+	 *
+	 * @covers WP_List_Table::row_actions()
+	 */
+	public function test_row_actions_should_return_empty_string_when_non_countable_actions_is_passed() {
+		$row_actions = new ReflectionMethod( $this->list_table, 'row_actions' );
+		$row_actions->setAccessible( true );
+
+		$actual = $row_actions->invokeArgs( $this->list_table, array( '' ) );
+
+		$this->assertSame( '', $actual );
+	}
 }