message: fix draw eval goal if no eval agents
diff: @@ -198,7 +198,7 @@ class BaseViewer(Viewer):
  # draw agent goals
  for agent_id, agent in world.agents.items():
  - if self.draw_eval_goals and agent.goal_definition and \
  + if eval_agent_ids and self.draw_eval_goals and agent.goal_definition and \
  agent_id == eval_agent_ids[0]:
  color = self.eval_goal_color
  try:
  