[#1448] container/ape: Ignore an error when getting a role

When getting a role in the APE checker for the container services,
an error may be returned if network maps of the previous two epochs
don't have enough nodes to fulfil a container placement policy.
It's a logical error, so we should ignore it.

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

pkg/services/container/ape.go

@@ -537,10 +537,7 @@ func (ac *apeChecker) isContainerKey(pk []byte, cnrID cid.ID, cont *containercor
 		return false, err
 	}
 
-	in, err := isContainerNode(nm, pk, binCnrID, cont)
-	if err != nil {
-		return false, err
-	} else if in {
+	if isContainerNode(nm, pk, binCnrID, cont) {
 		return true, nil
 	}
 
@@ -551,24 +548,24 @@ func (ac *apeChecker) isContainerKey(pk []byte, cnrID cid.ID, cont *containercor
 		return false, err
 	}
 
-	return isContainerNode(nm, pk, binCnrID, cont)
+	return isContainerNode(nm, pk, binCnrID, cont), nil
 }
 
-func isContainerNode(nm *netmapSDK.NetMap, pk, binCnrID []byte, cont *containercore.Container) (bool, error) {
-	cnrVectors, err := nm.ContainerNodes(cont.Value.PlacementPolicy(), binCnrID)
-	if err != nil {
-		return false, err
-	}
+func isContainerNode(nm *netmapSDK.NetMap, pk, binCnrID []byte, cont *containercore.Container) bool {
+	// It could an error only if the network map doesn't have enough nodes to
+	// fulfil the policy. It's a logical error that doesn't affect an actor role
+	// determining, so we ignore it
+	cnrVectors, _ := nm.ContainerNodes(cont.Value.PlacementPolicy(), binCnrID)
 
 	for i := range cnrVectors {
 		for j := range cnrVectors[i] {
 			if bytes.Equal(cnrVectors[i][j].PublicKey(), pk) {
-				return true, nil
+				return true
 			}
 		}
 	}
 
-	return false, nil
+	return false
 }
 
 func (ac *apeChecker) namespaceByOwner(owner *refs.OwnerID) (string, error) {