🛠️ VSÃVérification si paramètres null

source/Trek-12/Models/Rules/Rules.cs

@@ -175,6 +175,8 @@ namespace Models.Rules
         {
             List<Cell> adjacentCells = new List<Cell>();
             
+            if (choosenCell == null || cells == null) return adjacentCells;
+
             foreach (var cell in cells)
             {
                 if (choosenCell == cell) continue;