sarama client panic: assignment to entry in nil map

[handsomewwu]

sarama version: v1.26.1

sarama will panic at client.go:533 while fetching metadata when the client is closed

client.brokers will be nil when the client is closed, but sarama does not check if client.brokers is nil before client.go:533

[handsomewwu]

#422
this problem still happen
@eapache

[handsomewwu]

panic: assignment to entry in nil map
goroutine 1393273 [running]:
github.com/Shopify/sarama.(*client).registerBroker(0xc00001e750, 0xc001c69500)
github.com/Shopify/sarama/client.go:533 +0x2cb
github.com/Shopify/sarama.(*client).updateMetadata(0xc00001e750, 0xc00064b8b0, 0xc00064b800, 0x0, 0x0, 0x0)
github.com/Shopify/sarama/client.go:844 +0xd5
github.com/Shopify/sarama.(*client).tryRefreshMetadata(0xc00001e750, 0xc001b61b10, 0x1, 0x1, 0x3, 0x0, 0x0, 0x0, 0x10, 0x7f6e50502e98)
github.com/Shopify/sarama/client.go:789 +0x82d
github.com/Shopify/sarama.(*client).RefreshMetadata(0xc00001e750, 0xc001b61b10, 0x1, 0x1, 0x1d693212d88835, 0xc00064b818)
/github.com/Shopify/sarama/client.go:442 +0xb0
github.com/Shopify/sarama.(*consumerGroup).topicToPartitionNumbers(0xc00001e7e0, 0xc001b61b10, 0x1, 0x1, 0x0, 0x7000102, 0x0)
/github.com/Shopify/sarama/consumer_group.go:472 +0x72
github.com/Shopify/sarama.(*consumerGroup).loopCheckPartitionNumbers(0xc00001e7e0, 0xc001b61b10, 0x1, 0x1, 0xc000337600)
/github.com/Shopify/sarama/consumer_group.go:450 +0xe0
created by github.com/Shopify/sarama.(*consumerGroup).Consume
/github.com/Shopify/sarama/consumer_group.go:178 +0x232

[handsomewwu]

sorry this problem is fixed