feat(test-service): set default for current_alert_id to null if not a…

…lert_id is provided

includes/services/class-test-service.php

@@ -29,6 +29,7 @@ public function update_test_from_comparison( $alert_id, $test_id, $data ) {
 			// Update test row with new id foreign key and add latest screenshot.
 			// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- It's ok.
 			$update_data = [
+				'current_alert_id' => null,
 				'next_run_date' => $data['next_run_at'] ?? '',
 				'last_comparison_date' => $comparison['updated_at'],
 				'base_screenshot_url' => $comparison['screenshot']['image_url'],