Restore the recommended LLM API fallback for LiteLLM (#179768)

Co-authored-by: Claude <noreply@anthropic.com>

homeassistant/components/litellm/config_flow.py

@@ -180,7 +180,7 @@ class ConversationFlowHandler(LiteLLMSubentryFlowHandler):
             return self.async_abort(reason="entry_not_loaded")
 
         if user_input is not None:
-            if not user_input.get(CONF_LLM_HASS_API):
+            if user_input.get(CONF_LLM_HASS_API) is None:
                 user_input.pop(CONF_LLM_HASS_API, None)
             if self._is_new:
                 return self.async_create_entry(
@@ -241,7 +241,10 @@ class ConversationFlowHandler(LiteLLMSubentryFlowHandler):
                     ): TemplateSelector(),
                     vol.Optional(
                         CONF_LLM_HASS_API,
-                        default=self.options.get(CONF_LLM_HASS_API, []),
+                        default=self.options.get(
+                            CONF_LLM_HASS_API,
+                            RECOMMENDED_CONVERSATION_OPTIONS[CONF_LLM_HASS_API],
+                        ),
                     ): SelectSelector(
                         SelectSelectorConfig(options=hass_apis, multiple=True)
                     ),

tests/components/litellm/test_config_flow.py

@@ -242,6 +242,7 @@ async def test_create_conversation_agent_no_control(
     assert result["data"] == {
         CONF_MODEL: "gpt-3.5-turbo",
         CONF_PROMPT: "you are an assistant",
+        CONF_LLM_HASS_API: [],
     }
 
 
@@ -360,7 +361,7 @@ async def test_reconfigure_conversation_agent_disable_llm_api(
     )
     assert result["type"] is FlowResultType.ABORT
     assert result["reason"] == "reconfigure_successful"
-    assert CONF_LLM_HASS_API not in mock_config_entry.subentries[subentry_id].data
+    assert mock_config_entry.subentries[subentry_id].data[CONF_LLM_HASS_API] == []
 
     result = await mock_config_entry.start_subentry_reconfigure_flow(hass, subentry_id)
     schema = result["data_schema"].schema