IPVGO: ensure offline nodes 2: electric boogaloo (#2072)

src/Go/boardState/offlineNodes.ts

@@ -33,6 +33,8 @@ export function addObstacles(boardState: BoardState) {
 
   boardState.board = addDeadNodesToEdge(boardState.board, random, edgeDeadCount);
 
+  boardState.board = ensureOfflineNodes(boardState.board);
+
   boardState.board = resetCoordinates(boardState.board);
 }
 
@@ -112,6 +114,14 @@ function addCenterBreak(board: Board, random: rand) {
   return randomizeRotation(board, random);
 }
 
+function ensureOfflineNodes(board: Board) {
+  if (board.flat().some((point) => !point)) {
+    return board;
+  }
+  board[0][0] = null;
+  return board;
+}
+
 function randomizeRotation(board: Board, random: rand) {
   return rotateNTimes(board, random(0, 3));
 }