Model manager fixes (#3541)

Fix lora import
Fix sd2 config - `variant` field not added
Fix list models api - `base_model` arg not provided, redundant assert
check

invokeai/app/api/routers/models.py

@@ -80,7 +80,7 @@ async def list_models(
     ),
 ) -> ModelsList:
     """Gets a list of models"""
-    models_raw = ApiDependencies.invoker.services.model_manager.list_models(model_type)
+    models_raw = ApiDependencies.invoker.services.model_manager.list_models(base_model, model_type)
     models = parse_obj_as(ModelsList, { "models": models_raw })
     return models
 

invokeai/backend/model_management/model_manager.py

@@ -512,7 +512,6 @@ def list_models(
         named 'model-name', and model_manager.config to get the full OmegaConf
         object derived from models.yaml
         """
-        assert not(model_type is not None and base_model is None), "model_type must be provided with base_model"
 
         models = dict()
         for model_key in sorted(self.models, key=str.casefold):

invokeai/backend/model_management/models/lora.py

@@ -1,3 +1,4 @@
+import os
 import torch
 from typing import Optional, Union, Literal
 from .base import (

invokeai/backend/model_management/models/stable_diffusion.py

@@ -123,13 +123,15 @@ class StableDiffusion2Model(DiffusersModel):
     class DiffusersConfig(ModelConfigBase):
         format: Literal["diffusers"]
         vae: Optional[str] = Field(None)
+        variant: ModelVariantType
         prediction_type: SchedulerPredictionType
         upcast_attention: bool
 
     class CheckpointConfig(ModelConfigBase):
         format: Literal["checkpoint"]
         vae: Optional[str] = Field(None)
         config: Optional[str] = Field(None)
+        variant: ModelVariantType
         prediction_type: SchedulerPredictionType
         upcast_attention: bool