fix(repl): don't panic on undefined exception (#18888)

Fixes regression from #18878 where `Promise.reject()`,
`Promise.reject(undefined)` and `reportError(undefined)` panic in the
REPL.
Fixes `throw undefined` printing `Uncaught Unknown exception` instead of
`Uncaught undefined`.

1 files changed, 1 insertions, 1 deletions

diff --git a/cli/tools/repl/mod.rs b/cli/tools/repl/mod.rs
index 0a6d9b9e9..59b79ce86 100644
--- a/cli/tools/repl/mod.rs
+++ b/cli/tools/repl/mod.rs
@@ -70,7 +70,7 @@ async fn read_line_and_poll(
             let exception_details = params.get("exceptionDetails").unwrap().as_object().unwrap();
             let text = exception_details.get("text").unwrap().as_str().unwrap();
             let exception = exception_details.get("exception").unwrap().as_object().unwrap();
-            let description = exception.get("description").unwrap().as_str().unwrap();
+            let description = exception.get("description").and_then(|d| d.as_str()).unwrap_or("undefined");
             println!("{text} {description}");
           }
         }