if (id == null) return null;
    public synchronized Inventory findOrMakeInventory(String supplytype, String id) {	Asset resource = theLDMF.getPrototype(id);	if (resource == null) {	    GLMDebug.DEBUG("InventoryPlugIn", "<"+supplytype+"> createInventory fail to get prototype for "+id);	    resource = theLDMF.createPrototype(supplytype, id);	}	if (resource == null) {	    GLMDebug.ERROR("InventoryPlugIn","<"+supplytype+"> createInventory fail to make prototype for "+id);	    return null;	}	return findOrMakeInventory(supplytype, resource);    }