Issue #206: Don’t add group layers to LegendLayer.subLayerIds.
Issue #206: Don’t add group layers to LegendLayer.subLayerIds.

CanterburyRegionalCouncil/arcgis-viewer-flex,CanterburyRegionalCouncil/arcgis-viewer-flex,Esri/arcgis-viewer-flex,CanterburyRegionalCouncil/arcgis-viewer-flex,Esri/arcgis-viewer-flex