chore: default zoning params in DvrpTravelTimeMatrixParams #3483
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@nkuehnel
In the DvrpConfigGroup class, the getTravelTimeMatrixParams() method creates a DvrpTravelTimeMatrixParams on the fly if it doesn't already exist (meaning it wasn't in the XML input or it wasn't added by the script that created the DvrpConfigGroup).
However, when a DvrpTravelTimeMatrixParams is created in the above mentioned method, no ZoneSystemParams is created inside it. Which then causes a NullPointerException whenever the ZoneSystemParams is requested and used.
To address this, this PR continues the same approach of creating the params on the fly by creating a SquareGridZoneSystemParams with a cellSize of 200m, as was the default in the old implementation.