[#799] policer: Refactor method processNodes

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

pkg/services/policer/check.go

@@ -132,21 +132,21 @@ func (p *Policer) processNodes(ctx context.Context, requirements *placementRequi
 
 			cancel()
 
-			if client.IsErrObjectNotFound(err) {
+			if err == nil {
-				checkedNodes.submitReplicaCandidate(nodes[i])
-				continue
-			}
-
-			if isClientErrMaintenance(err) {
-				shortage, uncheckedCopies = p.handleMaintenance(nodes[i], checkedNodes, shortage, uncheckedCopies)
-			} else if err != nil {
-				p.log.Error(logs.PolicerReceiveObjectHeaderToCheckPolicyCompliance,
-					zap.Stringer("object", addr),
-					zap.String("error", err.Error()),
-				)
-			} else {
 				shortage--
 				checkedNodes.submitReplicaHolder(nodes[i])
+			} else {
+				if client.IsErrObjectNotFound(err) {
+					checkedNodes.submitReplicaCandidate(nodes[i])
+					continue
+				} else if isClientErrMaintenance(err) {
+					shortage, uncheckedCopies = p.handleMaintenance(nodes[i], checkedNodes, shortage, uncheckedCopies)
+				} else {
+					p.log.Error(logs.PolicerReceiveObjectHeaderToCheckPolicyCompliance,
+						zap.Stringer("object", addr),
+						zap.String("error", err.Error()),
+					)
+				}
 			}
 		}