Game displays an error message when a save file could not be loaded.

squirrelbattle/game.py

@@ -1,6 +1,6 @@
 # Copyright (C) 2020 by ÿnérant, eichhornchen, nicomarg, charlse
 # SPDX-License-Identifier: GPL-3.0-or-later
-
+from json import JSONDecodeError
 from random import randint
 from typing import Any, Optional
 import json
@@ -37,7 +37,7 @@ class Game:
         self.settings.write_settings()
         self.settings_menu.update_values(self.settings)
         self.logs = Logs()
-        self.message = "Vive les écureuils"
+        self.message = None
 
     def new_game(self) -> None:
         """
@@ -139,8 +139,15 @@ class Game:
         Loads the game from a dictionary
         """
         self.map.load_state(d)
-        # noinspection PyTypeChecker
-        self.player = self.map.find_entities(Player)[0]
+        players = self.map.find_entities(Player)
+        if not players:
+            self.message = "No player was found on this map!\n" \
+                           "Maybe you died?"
+            self.player.health = 0
+            self.display_actions(DisplayActions.UPDATE)
+            return
+
+        self.player = players[0]
         self.display_actions(DisplayActions.UPDATE)
 
     def load_game(self) -> None:
@@ -150,7 +157,14 @@ class Game:
         file_path = ResourceManager.get_config_path("save.json")
         if os.path.isfile(file_path):
             with open(file_path, "r") as f:
-                self.load_state(json.loads(f.read()))
+                try:
+                    state = json.loads(f.read())
+                    self.load_state(state)
+                except JSONDecodeError:
+                    self.message = "The JSON file is not correct.\n" \
+                                   "Your save seems corrupted. It got deleted."
+                    os.unlink(file_path)
+                    self.display_actions(DisplayActions.UPDATE)
 
     def save_game(self) -> None:
         """