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

oracle-database-operator keeps CrashLoopBackOff for a SingleInstanceDatabase runtime.

Stack Trace:

21.3.0.0.0
{"reconciler group": "database.oracle.com", "reconciler kind": "SingleInstanceDatabase", "name": "maximodb", "namespace": "oracle-database-operator", "GetDatabaseVersion": "oracle-database-operator/maximodb"}
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1a1639e]
goroutine 1630 [running]:
github.com/oracle/oracle-database-operator/controllers/database.(*SingleInstanceDatabaseReconciler).deleteWallet(0xc000665180, 0x3, {0x224ee98, 0xc0033667b0}, {{{0xc0002b4618, 0xe}, {0xc000383678, 0x0}}})
/workspace/controllers/database/singleinstancedatabase_controller.go:1665 +0xde
github.com/oracle/oracle-database-operator/controllers/database.(*SingleInstanceDatabaseReconciler).Reconcile(0xc000665180, {0x224ee98, 0xc0033667b0}, {{{0xc0002b4618, 0x1e6bac0}, {0xc000383678, 0x30}}})
/workspace/controllers/database/singleinstancedatabase_controller.go:188 +0x877
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile(0xc000648420, {0x224ee98, 0xc003366720}, {{{0xc0002b4618, 0x1e6bac0}, {0xc000383678, 0x413c14}}})
/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.11.2/pkg/internal/controller/controller.go:114 +0x26f
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler(0xc000648420, {0x224edf0, 0xc000a1df80}, {0x1d15660, 0xc000662960})
/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.11.2/pkg/internal/controller/controller.go:311 +0x33e
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem(0xc000648420, {0x224edf0, 0xc000a1df80})
/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.11.2/pkg/internal/controller/controller.go:266 +0x205
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2()
/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.11.2/pkg/internal/controller/controller.go:227 +0x85
created by sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2

Start in controllers/database/singleinstancedatabase_controller.go at deleteWallet, line 1665, then follow its call from Reconcile at line 188. Reproduce the reported SingleInstanceDatabase runtime and inspect the nil value involved in that path. Done means reconciliation no longer panics and the operator does not remain in CrashLoopBackOff.