Allow model or clip to be None in load_lora_for_models.

comfy/sd.py

@@ -55,13 +55,26 @@ def load_clip_weights(model, sd):
 
 
 def load_lora_for_models(model, clip, lora, strength_model, strength_clip):
-    key_map = comfy.lora.model_lora_keys_unet(model.model)
-    key_map = comfy.lora.model_lora_keys_clip(clip.cond_stage_model, key_map)
+    key_map = {}
+    if model is not None:
+        key_map = comfy.lora.model_lora_keys_unet(model.model, key_map)
+    if clip is not None:
+        key_map = comfy.lora.model_lora_keys_clip(clip.cond_stage_model, key_map)
+
     loaded = comfy.lora.load_lora(lora, key_map)
-    new_modelpatcher = model.clone()
-    k = new_modelpatcher.add_patches(loaded, strength_model)
-    new_clip = clip.clone()
-    k1 = new_clip.add_patches(loaded, strength_clip)
+    if model is not None:
+        new_modelpatcher = model.clone()
+        k = new_modelpatcher.add_patches(loaded, strength_model)
+    else:
+        k = ()
+        new_modelpatcher = None
+
+    if clip is not None:
+        new_clip = clip.clone()
+        k1 = new_clip.add_patches(loaded, strength_clip)
+    else:
+        k1 = ()
+        new_clip = None
     k = set(k)
     k1 = set(k1)
     for x in loaded: