bug: Fix to generate OperatorGroup definition when namespaces definition has labels

- Added condition to check if operatorGroup key exists  {{- if or $v.operatorGroup (not (hasKey $v "operatorGroup")) }}
- Default behavior is that we generate an OperatorGroup for a Namespace definition.

Author: claudiol

clustergroup/templates/_helpers.tpl

@@ -195,7 +195,7 @@ spec:
 {{- if or (empty $operatorgroupExcludes) (not (has . $operatorgroupExcludes)) }}
   {{- range $k, $v := $ns }}{{- /* We loop here even though the map has always just one key */}}
   {{- if $v }}
-    {{- if $v.operatorGroup }}{{- /* Checks if the user sets operatorGroup: false */}}
+    {{- if or $v.operatorGroup (not (hasKey $v "operatorGroup")) }}{{- /* Checks if the user sets operatorGroup: false */}}
 apiVersion: operators.coreos.com/v1
 kind: OperatorGroup
 metadata: