Introduce Character agent, displacing Conversation agent

backend/src/app.py

@@ -15,7 +15,7 @@ import agent as agent_mod
 from server import start_server
 from chat import ChatView, Message, MESSAGE_PAGE_SIZE
 
-from agents.conversation import ConversationAgent
+from agents.character import CharacterAgent
 from app_mixins import ChatMixin
 
 class App(ChatMixin):
@@ -37,7 +37,8 @@ class App(ChatMixin):
         # `Agent` is the kind 'basic', will be class `BasicAgent` in the future
         self.agent_classes = [
             agent_mod.BasicAgent,
-            ConversationAgent,
+            CharacterAgent,
+
             agent_mod.LlamaAgent,
             agent_mod.CoderV1Agent,
             agent_mod.ToolUsingAgent,
@@ -88,7 +89,7 @@ class App(ChatMixin):
             agent.description = description
             agent.picture = picture
             agent.kind = kind
-            agent.data = data
+            agent.data = data or {}
 
             session.add(agent)
             session.commit()