To be invoked when an exceptional situation prevents computation of a tile.
@param eventSource The actual emitter of the tile scheduling event, i.e.,the caller of this method.
@param requests The relevant tile computation requests as returnedby the method used to queue the tile.
@param image The image for which tiles are being computed asspecified to the TileScheduler.
@param tileX The X index of the tile in the tile array.
@param tileY The Y index of the tile in the tile array.
@param situation An object describing the error or exception whichprevented computation of the tile.
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