@Override public WorkflowTask fromProto(final WorkflowTaskPb.WorkflowTask from) {
        final WorkflowTask workflowTask = super.fromProto(from);
        if (from.getRetryCount() == NO_RETRY_VALUE) {
            workflowTask.setRetryCount(null);
        }
        return workflowTask;
    }
Convert a WorkflowTaskList message wrapper into a {@link List} instance
with its contents.

@param list an instance of a ProtoBuf message
@return a list with the contents of the message
grpc/src/main/java/com/netflix/conductor/grpc/ProtoMapper.java