修正场地背景判断、修正解析CardInfo消息的一个崩溃

lib/iduel/action.rb

@@ -193,6 +193,8 @@ class Action
           CardInfo.new(card, $1.to_sym, $5 == "？" ? nil : $5.to_i, $6 == "？" ? nil : $6.to_i, $3.to_sym, $2.to_sym, $4.to_sym, $7)
         when /(魔法|陷阱)种类：(.+),效果：(.+)/
           CardInfo.new(card, ($2+$1).to_sym, nil, nil, nil, nil, nil, $3)
+        else
+          Unknown.new str
         end
       when /^※(.*)$/
         Chat.new from_player, $1

lib/scene_duel.rb

@@ -169,7 +169,7 @@ class Scene_Duel < Scene
     super
   end
   def refresh
-    @fieldback_window.card = $game.player_field.field[0] || $game.opponent_field.field[0]
+    @fieldback_window.card = $game.player_field.field[0] && $game.player_field.field[0].card_type == :场地魔法 && $game.player_field.field[0].position == :attack ? $game.player_field.field[0] : $game.opponent_field.field[0] && $game.opponent_field.field[0].card_type == :场地魔法 && $game.opponent_field.field[0].position == :attack ? $game.opponent_field.field[0] : nil
     @player_field_window.refresh
     @opponent_field_window.refresh
     @phases_window.player = $game.turn_player