fix: helm upgrade fails when imagePullSecrets is not defined

[paliwalparitosh]

Error During Helm upgrade:

client.go:693: [debug] Patch DaemonSet "oci-onm-dev-logan" in namespace oci-onm-dev client.go:425: [debug] error updating the resource "oci-onm-dev-discovery": failed to create patch: map: map[] does not contain declared merge key: name upgrade.go:468: [debug] warning: Upgrade "oci-kubernetes-monitoring-dev" failed: failed to create patch: map: map[] does not contain declared merge key: name Error: UPGRADE FAILED: failed to create patch: map: map[] does not contain declared merge key: name helm.go:84: [debug] failed to create patch: map: map[] does not contain declared merge key: name helm.sh/helm/v3/pkg/kube.(*Client).Update helm.sh/helm/v3/pkg/kube/client.go:438 helm.sh/helm/v3/pkg/action.(*Upgrade).releasingUpgrade helm.sh/helm/v3/pkg/action/upgrade.go:410 runtime.goexit runtime/asm_arm64.s:1222 UPGRADE FAILED main.newUpgradeCmd.func2 helm.sh/helm/v3/cmd/helm/upgrade.go:238 github.com/spf13/cobra.(*Command).execute github.com/spf13/[email protected]/command.go:983 github.com/spf13/cobra.(*Command).ExecuteC github.com/spf13/[email protected]/command.go:1115 github.com/spf13/cobra.(*Command).Execute github.com/spf13/[email protected]/command.go:1039 main.main helm.sh/helm/v3/cmd/helm/helm.go:83 runtime.main runtime/proc.go:271 runtime.goexit runtime/asm_arm64.s:1222