fix method missing arg

adaface/adaface_wrapper.py

@@ -253,7 +253,10 @@ class AdaFaceWrapper(nn.Module):
             self.update_text_encoder_subj_embs(adaface_subj_embs)
         return adaface_subj_embs
 
-    def encode_prompt(self, prompt, negative_prompt, device="cuda", verbose=False):
+    def encode_prompt(self, prompt, negative_prompt=None, device="cuda", verbose=False):
+        if negative_prompt is None:
+            negative_prompt = self.negative_prompt
+                    
         prompt = self.update_prompt(prompt)
         if verbose:
             print(f"Prompt: {prompt}")