add error_message for steps that have the status pending (#2393)

Author: markstein

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 Please see [CONTRIBUTING.md](./CONTRIBUTING.md) on how to contribute to Cucumber.
 
 ## [Unreleased]
+- Add error message for pending steps ([#2392](https://github.com/cucumber/cucumber-js/pull/2393))
 
 ## [10.4.0] - 2024-04-07
 ### Added

src/runtime/step_runner.ts

@@ -68,12 +68,15 @@ export async function run({
   } else if (result === 'pending') {
     status = messages.TestStepResultStatus.PENDING
   } else if (doesHaveValue(error)) {
-    details = formatError(error, filterStackTraces)
     status = messages.TestStepResultStatus.FAILED
   } else {
     status = messages.TestStepResultStatus.PASSED
   }
 
+  if (doesHaveValue(error)) {
+    details = formatError(error, filterStackTraces)
+  }
+
   return {
     duration,
     status,