[#1103] node: Implement `Get\Head` requests for EC object

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

pkg/services/object/get/assemblerec.go

@@ -101,6 +101,7 @@ func (a *assemblerec) retrieveParts(mainCtx context.Context, headOnly bool) []*o
 				obj, err = a.objGetter.GetObjectAndWritePayload(ctx, *objID, nil, sow)
 				if err != nil {
 					a.log.Debug(logs.GetUnableToGetPartECObject, zap.Stringer("part_id", objID), zap.Error(err))
+					return nil
 				}
 				obj.SetPayload(sow.pld)
 			}