Initialize cm.Data if it is nil. This happens if the configMap exists…

… but does not have any data in it, and in this case it was not possible to update the dashboard settings. (#3280)

Signed-off-by: Stefan Sundin <[email protected]>

src/app/backend/settings/manager.go

@@ -105,6 +105,11 @@ func (sm *SettingsManager) SaveGlobalSettings(client kubernetes.Interface, s *ap
 		return errors.New(api.ConcurrentSettingsChangeError)
 	}
 
+	// Data can be nil if the configMap exists but does not have any data
+	if cm.Data == nil {
+		cm.Data = make(map[string]string)
+	}
+
 	cm.Data[api.GlobalSettingsKey] = s.Marshal()
 	_, err := client.CoreV1().ConfigMaps(api.SettingsConfigMapNamespace).Update(cm)
 	return err