[topic] fix missing map initialization

Author: shmel1k

internal/grpcwrapper/rawtopic/describe_topic.go

@@ -69,6 +69,7 @@ func (res *DescribeTopicResult) FromProto(protoResponse *Ydb_Topic.DescribeTopic
 		}
 	}
 
+	res.Attributes = make(map[string]string)
 	for k, v := range protoResult.Attributes {
 		res.Attributes[k] = v
 	}

topic/topictypes/topictypes.go

@@ -146,6 +146,8 @@ func (d *TopicDescription) FromRaw(raw *rawtopic.DescribeTopicResult) {
 
 	d.PartitionWriteSpeedBytesPerSecond = raw.PartitionWriteSpeedBytesPerSecond
 	d.PartitionWriteBurstBytes = raw.PartitionWriteBurstBytes
+
+	d.Attributes = make(map[string]string)
 	for k, v := range raw.Attributes {
 		d.Attributes[k] = v
 	}
@@ -172,6 +174,8 @@ func (d *TopicDescription) ToRaw(raw *rawtopic.DescribeTopicResult) {
 
 	raw.PartitionWriteBurstBytes = d.PartitionWriteBurstBytes
 	raw.PartitionWriteSpeedBytesPerSecond = d.PartitionWriteSpeedBytesPerSecond
+
+	raw.Attributes = make(map[string]string)
 	for k, v := range d.Attributes {
 		raw.Attributes[k] = v
 	}