Fix dimension of conditionally declared components

[beutlich]

close #2574

[HansOlsson]

The array dimension is so long that it becomes hard to read. Wouldn't it be possible to just say:
RealInput portsData_zeta_out_internal[:]=portsData.zeta_out if ....;
(and similarly for others).

[beutlich]

I rather prefer to have the dimensions explicit.

[HansOlsson]

How about having a common protected parameter for this size - something like nPortsOr0 (preferably more sensible name)?

[beutlich]

How about having a common protected parameter for this size

Yes, that is sensible, but probably more invasive (than just the four lines as now).

I hope that @casella will have a look at it and update this PR accordingly.

[casella]

Sounds good. I hope there is at least one test case for this addition.

[HansOlsson]

If you really insist I can accept giving the array dimensions.

[beutlich]

Considering @perost's edit from #2574 (comment), this is wrong.

[beutlich]

I hope there is at least one test case for this addition.

Modelica.Fluid.Examples.TraceSubstances.RoomCO2WithControls has use_portsData = false and nPorts =4.