ST-1380 avoid null

Signed-off-by: Matteo Di Carlo <matteo.dicarlo@inaf.it>

charts/ska-tango-base/templates/databaseds.yaml

@@ -30,8 +30,10 @@ metadata:
       {{`{{- end }}`}}
       {{`{{- end }}`}}
     vault.hashicorp.com/role: "{{ .Values.databaseds.vault.role }}"
+{{- if or (.Values.global.annotations) (.Values.annotations) }}
 {{ toYaml (coalesce .Values.global.annotations .Values.annotations) | indent 4 }}
 {{- end }}
+{{- end }}
 spec:
   usePV: {{ .Values.tangodb.use_pv }}
 {{- if or (.Values.global.minikube) (.Values.global.exposeAllDS) }}