[#1710] object: Sign response even if CloseAndRecv returns error

* Sign service wraps an error with status and sign a response even
  if error occurs from `CloseAndRecv` in `Put` and `Patch` methods.

Close #1710

Change-Id: I7e1d8fe00db53607fa6e04ebec9a29b87349f8a1
Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

pkg/services/object/sign.go

@@ -96,7 +96,8 @@ func (s *putStreamSigner) CloseAndRecv(ctx context.Context) (resp *object.PutRes
 	} else {
 		resp, err = s.stream.CloseAndRecv(ctx)
 		if err != nil {
-			return nil, fmt.Errorf("could not close stream and receive response: %w", err)
+			err = fmt.Errorf("could not close stream and receive response: %w", err)
+			resp = new(object.PutResponse)
 		}
 	}
 
@@ -132,7 +133,8 @@ func (s *patchStreamSigner) CloseAndRecv(ctx context.Context) (resp *object.Patc
 	} else {
 		resp, err = s.stream.CloseAndRecv(ctx)
 		if err != nil {
-			return nil, fmt.Errorf("could not close stream and receive response: %w", err)
+			err = fmt.Errorf("could not close stream and receive response: %w", err)
+			resp = new(object.PatchResponse)
 		}
 	}