Operator panics while removing nodes from the server config

Test case: TestBasicMDSScaling

couchbase-operator]$ kubectl get pod

NAME                                  READY     STATUS    RESTARTS   AGE

couchbase-operator-5bdf548959-fn2xv   1/1       Running   3          10m

test-couchbase-c28v9-0000             1/1       Running   0          10m

Ashwins-MacBook-Pro:couchbase-operator]${noformat}

*Operator log prints:*

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x48 pc=0xfc7a48]
goroutine 88 [running]:
github.com/couchbase/couchbase-operator/pkg/apis/couchbase/v1.(*ServerConfig).GetVolumeMounts(...)
    /home/couchbase/jenkins/workspace/couchbase-operator-build/goproj/src/github.com/couchbase/couchbase-operator/pkg/apis/couchbase/v1/cluster.go:390
github.com/couchbase/couchbase-operator/pkg/cluster.(*Cluster).removePod(0xc420086d80, 0xc420126a00, 0x19, 0xc4208efb40, 0xc4208efb30)
    /home/couchbase/jenkins/workspace/couchbase-operator-build/goproj/src/github.com/couchbase/couchbase-operator/pkg/cluster/cluster.go:467 +0x328
github.com/couchbase/couchbase-operator/pkg/cluster.(*Cluster).destroyMember(0xc420086d80, 0xc420126a00, 0x19, 0x0, 0x0)
    /home/couchbase/jenkins/workspace/couchbase-operator-build/goproj/src/github.com/couchbase/couchbase-operator/pkg/cluster/reconcile.go:211 +0x43
github.com/couchbase/couchbase-operator/pkg/cluster.handleDeadMembers(0xc420125500, 0xc420086d80, 0x12f0590, 0x0)
    /home/couchbase/jenkins/workspace/couchbase-operator-build/goproj/src/github.com/couchbase/couchbase-operator/pkg/cluster/nodereconcile.go:556 +0xe9
github.com/couchbase/couchbase-operator/pkg/cluster.(*ReconcileMachine).step(0xc420125500, 0xc420086d80, 0x0, 0x0)
    /home/couchbase/jenkins/workspace/couchbase-operator-build/goproj/src/github.com/couchbase/couchbase-operator/pkg/cluster/nodereconcile.go:93 +0x6b
github.com/couchbase/couchbase-operator/pkg/cluster.(*ReconcileMachine).exec(0xc420125500, 0xc420086d80, 0xc420210a01, 0xc420125500)
    /home/couchbase/jenkins/workspace/couchbase-operator-build/goproj/src/github.com/couchbase/couchbase-operator/pkg/cluster/nodereconcile.go:108 +0x47
github.com/couchbase/couchbase-operator/pkg/cluster.(*Cluster).reconcileMembers(0xc420086d80, 0xc420125500, 0x0, 0xc420125440)
    /home/couchbase/jenkins/workspace/couchbase-operator-build/goproj/src/github.com/couchbase/couchbase-operator/pkg/cluster/reconcile.go:124 +0x35
github.com/couchbase/couchbase-operator/pkg/cluster.(*Cluster).reconcile(0xc420086d80, 0xc42028bdc0, 0x3, 0x4, 0x0, 0x0)
    /home/couchbase/jenkins/workspace/couchbase-operator-build/goproj/src/github.com/couchbase/couchbase-operator/pkg/cluster/reconcile.go:80 +0x42d
github.com/couchbase/couchbase-operator/pkg/cluster.(*Cluster).run(0xc420086d80)
    /home/couchbase/jenkins/workspace/couchbase-operator-build/goproj/src/github.com/couchbase/couchbase-operator/pkg/cluster/cluster.go:350 +0x723
github.com/couchbase/couchbase-operator/pkg/cluster.New.func1(0xc420086d80)
    /home/couchbase/jenkins/workspace/couchbase-operator-build/goproj/src/github.com/couchbase/couchbase-operator/pkg/cluster/cluster.go:150 +0x27b
created by github.com/couchbase/couchbase-operator/pkg/cluster.New
    /home/couchbase/jenkins/workspace/couchbase-operator-build/goproj/src/github.com/couchbase/couchbase-operator/pkg/cluster/cluster.go:137 +0x86a