[DAP] Catch any errors for getObject when requesting getters for a class

Bug: dart-lang/webdev#2297
Change-Id: Id7234e7dd758e16ea05fb4b4ccab1593f3ca5ea8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/342704
Reviewed-by: Ben Konyi <bkonyi@google.com>
Commit-Queue: Elliott Brooks <elliottbrooks@google.com>

pkg/dds/lib/src/dap/protocol_converter.dart

@@ -736,8 +736,14 @@ class ProtocolConverter {
     final getterNames = <String>{};
     final service = _adapter.vmService;
     while (service != null && classRef != null) {
-      final classResponse =
-          await service.getObject(thread.isolate.id!, classRef.id!);
+      vm.Obj classResponse;
+      try {
+        classResponse =
+            await service.getObject(thread.isolate.id!, classRef.id!);
+      } catch (e) {
+        _adapter.logger?.call('Failed to fetch getter for class: $e');
+        break;
+      }
       if (classResponse is! vm.Class) {
         break;
       }