Improved reliance of update_layers for WM service
Improved reliance of update_layers for WM service

cga-harvard/hypermap,cga-harvard/HHypermap,cga-harvard/HHypermap,cga-harvard/HHypermap,cga-harvard/hypermap,cga-harvard/hypermap,cga-harvard/HHypermap,cga-harvard/hypermap