Ref/simplify: Add empty patch for round 0

Author: klieret

codeclash/agents/abstract.py

@@ -36,8 +36,8 @@ def __init__(
         self._metadata = {
             "name": self.name,
             "player_unique_id": self._player_unique_id,
-            "diff": {},  # mapping round -> diff
-            "incremental_diff": {},  # mapping round -> diff
+            "diff": {0: ""},  # mapping round -> diff
+            "incremental_diff": {0: ""},  # mapping round -> diff
         }
 
     # --- Main methods ---

codeclash/tournaments/single_player_training.py

@@ -80,12 +80,8 @@ def run_main_agent(self, round_num: int):
 
     def set_mirror_state_to_round(self, round_num: int):
         """Update mirror agent's codebase with the main agent's changes."""
-        if round_num == 0:
-            full_diff = ""
-        else:
-            full_diff = self.agent.get_metadata()["diff"][round_num]
-            full_diff = filter_git_diff(full_diff)
-
+        full_diff = self.agent.get_metadata()["diff"][round_num]
+        full_diff = filter_git_diff(full_diff)
         self.mirror_agent.reset_and_apply_patch(full_diff)
 
     def cleanup(self):