修改非空断言可能会导致的崩溃错误

RoomManager.ts

@@ -57,9 +57,10 @@ class Room
         let tempPlayers:Map<string, Player> = new Map<string, Player>;
         for(const key of this.mPlayers.keys())
         {
-            if(this.mPlayers.get(key)!.mHp > 0)
+            const player = this.mPlayers.get(key);
+            if(player && player.mHp > 0)
             {
-                tempPlayers.set(key, this.mPlayers.get(key)!);
+                tempPlayers.set(key, player);
             }  
         }
         this.mMatchMaker.updatePlayers(tempPlayers);
@@ -145,18 +146,24 @@ export class RoomManager
 
     join(aRoomID:string, aName:string, aSocket:Socket):[boolean, string, number | null, Player | null]
     {
-        if(!this.mRooms.has(aRoomID))
+        const room = this.mRooms.get(aRoomID);
+        if (!room)
         {
             return [false, "No room Id", null, null];
         }
-
-        let room = this.mRooms.get(aRoomID)!;
         if(room.mPlayers.has(aName))
         {
             let player = room.mPlayers.get(aName);
-            player!.setPlayerSocketId(aSocket.id);
-            aSocket.join(aRoomID);
-            return [true, "", room.mStatus, player!];
+            if(player)
+            {
+                player.setPlayerSocketId(aSocket.id);
+                aSocket.join(aRoomID);
+                return [true, "", room.mStatus, player];
+            }
+            else
+            {
+                return [false, "unKnow error", null, null];
+            }
         }
 
         if(room.mPlayers.size < ALL_PLAYER_NUM)