Add DoubleCarrier test in C# and TypeScript; fix TypeScript undefined output in XML

[Copilot]

Adds DoubleCarrierTest to both the C# and TypeScript test suites, verifying XML code generation for a nested And/Eq/Distributor/Or/Coil ladder logic network. Also fixes a TypeScript bug where undefined optional properties were rendered as the literal string "undefined" in generated XML.

Changes

Bug fix – TypeScript XML generation

Optional string fields (titleEnglish, comment, commentEnglish on Block; description, descriptionEnglish on Network) were interpolated directly into template literals, producing <Text>undefined</Text> instead of <Text></Text>.

Fixed with nullish coalescing in Block.ts and KopCodeHelper.ts:

// Before
<Text>${this.titleEnglish}</Text>

// After
<Text>${this.titleEnglish ?? ''}</Text>

After the fix, TypeScript and C# produce identical XML output.

New tests

Both tests build the same network and assert the exact generated XML (newline-normalized):

nw.Add(
    new And(
        new Eq(new Signal("#Configuration.General.SingleDoubleCarrier", SignalType.Int), new Signal(2)),
        new Distributor(
            new And(
                new Or(
                    new Signal("#DoubleCarrier.Sensors.V[#Configuration.General.CoordinationAxisConveyor, 1]"),
                    new Signal("#DoubleCarrier.Sensors.R[#Configuration.General.CoordinationAxisConveyor, 1]")
                ),
                new Coil(new Signal("#CarrierGeneral.States.CarriageOccupied[2]"))
            ),
            new And(
                new Signal("#DoubleCarrierData.MOrder.DataPresent"),
                new Coil(new Signal("#CarrierGeneral.States.CarriageDataPresent[2]"))
            )
        )
    )
);

Housekeeping

Added TiaCodegen-ts/.gitignore to exclude dist/ and node_modules/ from version control.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Create a new test</issue_title>
<issue_description>create a new test in c#, wich contains this code:

       nw.Add(
          new And(
            new Eq(new Signal("#Configuration.General.SingleDoubleCarrier", SignalType.Int),new Signal(2)),
            new Distributor(
              new And(
                new Or(
                  new Signal("#DoubleCarrier.Sensors.V[#Configuration.General.CoordinationAxisConveyor, 1]"),
                  new Signal("#DoubleCarrier.Sensors.R[#Configuration.General.CoordinationAxisConveyor, 1]")
                ),
                new Coil(new Signal("#CarrierGeneral.States.CarriageOccupied[2]"))
              ),
              new And(
                new Signal("#DoubleCarrierData.MOrder.DataPresent"),
                new Coil(new Signal("#CarrierGeneral.States.CarriageDataPresent[2]"))
              )
            )
          )
        );

then run the test once, get the xml output. Adjust the test now so it always checks for the xml output.
Then create the same test in Typescript and compare it to the same xml output</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create a new test #26

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