[Backport MB-54316 to 7.0.5] - Indexer panic seen - runtime error: invalid memory address or nil pointer dereference

2022-10-28T01:20:50.359-07:00 [Info] RebalanceServiceManager::GetCurrentTopology []

2022-10-28T01:20:50.359-07:00 [Info] RebalanceServiceManager::GetCurrentTopology returns &{Rev:[0 0 0 0 0 0 0 13] Nodes:[221a78773f175db38d7d3d7c6be42ef8 85d5abdd9f8c66ae589d06cd94e137d0] IsBalanced:false Messages:[]}

2022-10-28T01:20:50.360-07:00 [Info] GenericServiceManager::GetTaskList: called with rev: [0 0 0 0 0 0 0 13]

2022-10-28T01:20:50.360-07:00 [Info] RebalanceServiceManager::GetCurrentTopology [0 0 0 0 0 0 0 13]

2022-10-28T01:20:50.369-07:00 [Info] DDLServiceMgr::rebalanceDone: Returned

panic: runtime error: invalid memory address or nil pointer dereference

[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0xb2a2b9]

goroutine 1147 [running]:

github.com/couchbase/indexing/secondary/common.(*internalVersionCache).Get(0x7f7d81d4f410?, {0xc005ad9180?, 0xc005b21190?})

	/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/indexing/secondary/common/internal_version.go:266 +0x39

github.com/couchbase/indexing/secondary/common.(*internalVersionChecker).getVerFailNodes(0xc005928980, 0xc006094540)

	/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/indexing/secondary/common/internal_version.go:502 +0x393

github.com/couchbase/indexing/secondary/common.(*internalVersionChecker).getVersion(0xc005928980)

	/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/indexing/secondary/common/internal_version.go:435 +0x3a5

github.com/couchbase/indexing/secondary/common.GetInternalClusterVersion({0x1baf1a8?, 0xc004e60c80}, 0x1)

	/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/indexing/secondary/common/internal_version.go:765 +0x377

github.com/couchbase/indexing/secondary/manager/client.NewMetadataProvider({0x7fffda82b76c, 0xe}, {0xc005b42318, 0x16}, 0x0, 0x0, {0x1bace10?, 0xc0005ccdc0})

	/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/indexing/secondary/manager/client/metadata_provider.go:257 +0x3ee

github.com/couchbase/indexing/secondary/indexer.newMetadataProvider({0x7fffda82b76c, 0xe}, 0xc005f3d620, 0x20?, {0x17ac1b0, 0x1d})

	/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/indexing/secondary/indexer/ddl_service_manager.go:1888 +0x745

github.com/couchbase/indexing/secondary/indexer.(*DDLServiceMgr).rebalanceDone(0xc004560840, 0xc0002011f0, 0x0)

	/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/indexing/secondary/indexer/ddl_service_manager.go:329 +0x17d

github.com/couchbase/indexing/secondary/indexer.notifyRebalanceDone(0x12e3a46?, 0x80?)

	/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/indexing/secondary/indexer/ddl_service_manager.go:307 +0x39

created by github.com/couchbase/indexing/secondary/indexer.(*RebalanceServiceManager).rebalanceOrFailoverDoneCallback.func1.1

	/home/couchbase/jenkins/workspace/couchbase-server-unix/goproj/src/github.com/couchbase/indexing/secondary/indexer/rebalance_service_manager.go:2042 +0x7a