#1068 fixed (Illegal uses of conditional components in Fluid.Vessels)
by using the proposed declaration:
   parameter VesselPortsData[if use_portsData then nPorts else 0] portsData;
instead of the (claimed) wrong declaration
   parameter VesselPortsData[nPorts] portsData if use_portsData


git-svn-id: https://svn.modelica.org/projects/Modelica/trunk@6497 7ce873d0-865f-4ce7-a662-4bb36ea78beb