Revert "web client: log invalid tile index."
Revert "web client: log invalid tile index."

This reverts commit 08a573aa6406298830ed3f9b74ff25fc3708c551.

adaxi/freeciv-web,adaxi/freeciv-web,adaxi/freeciv-web,andreasrosdal/freeciv-web,adaxi/freeciv-web,andreasrosdal/freeciv-web,andreasrosdal/freeciv-web,adaxi/freeciv-web,andreasrosdal/freeciv-web,andreasrosdal/freeciv-web