Fix potential issue with Save Checkpoint.

comfy/supported_models.py

@@ -126,6 +126,7 @@ class SDXLRefiner(supported_models_base.BASE):
     def process_clip_state_dict_for_saving(self, state_dict):
         replace_prefix = {}
         state_dict_g = diffusers_convert.convert_text_enc_state_dict_v20(state_dict, "clip_g")
+        if "clip_g.transformer.text_model.embeddings.position_ids" in state_dict_g:
             state_dict_g.pop("clip_g.transformer.text_model.embeddings.position_ids")
         replace_prefix["clip_g"] = "conditioner.embedders.0.model"
         state_dict_g = supported_models_base.state_dict_prefix_replace(state_dict_g, replace_prefix)
@@ -171,6 +172,7 @@ class SDXL(supported_models_base.BASE):
         replace_prefix = {}
         keys_to_replace = {}
         state_dict_g = diffusers_convert.convert_text_enc_state_dict_v20(state_dict, "clip_g")
+        if "clip_g.transformer.text_model.embeddings.position_ids" in state_dict_g:
             state_dict_g.pop("clip_g.transformer.text_model.embeddings.position_ids")
         for k in state_dict:
             if k.startswith("clip_l"):