fix nilerr issues

Author: grishagavrin

internal/grpcwrapper/rawtopic/describe_topic.go

@@ -43,7 +43,7 @@ type DescribeTopicResult struct {
 
 func (res *DescribeTopicResult) FromProto(protoResponse *Ydb_Topic.DescribeTopicResponse) error {
 	if err := res.Operation.FromProtoWithStatusCheck(protoResponse.Operation); err != nil {
-		return nil
+		return err
 	}
 
 	protoResult := &Ydb_Topic.DescribeTopicResult{}

internal/grpcwrapper/rawydb/issues.go

@@ -17,7 +17,7 @@ func (issuesPointer *Issues) FromProto(p []*Ydb_Issue.IssueMessage) error {
 	issues := *issuesPointer
 	for i := range issues {
 		if err := issues[i].FromProto(p[i]); err != nil {
-			return nil
+			return err
 		}
 	}
 	return nil