fix: fix the issue which the server-side did not report failure after a panic occurred during request processing

Author: YangruiEmma

pkg/remote/trans/default_server_handler.go

@@ -144,11 +144,9 @@ func (t *svrTransHandler) OnRead(ctx context.Context, conn net.Conn) (err error)
 			} else {
 				klog.CtxErrorf(ctx, "KITEX: panic happened, error=%v\nstack=%s", panicErr, stack)
 			}
-			if err != nil {
-				wrapErr = kerrors.ErrPanic.WithCauseAndStack(fmt.Errorf("[happened in OnRead] %s, last error=%s", panicErr, err.Error()), stack)
-			} else {
-				wrapErr = kerrors.ErrPanic.WithCauseAndStack(fmt.Errorf("[happened in OnRead] %s", panicErr), stack)
+			if err == nil {
 				// if err is nil, set err as panic wrapErr
+				wrapErr = kerrors.ErrPanic.WithCauseAndStack(fmt.Errorf("[happened in OnRead] %s", panicErr), stack)
 				err = remote.NewTransError(remote.InternalError, wrapErr)
 				t.writeErrorReplyIfNeeded(ctx, recvMsg, conn, err, ri, true)
 			}