check for text attr and save

server.py

@@ -235,6 +235,7 @@ class PromptServer():
                 if os.path.isfile(file):
                     with Image.open(file) as original_pil:
                         metadata = PngInfo()
+                        if hasattr(original_pil,'text'):
                             for key in original_pil.text:
                                 metadata.add_text(key, original_pil.text[key])
                         original_pil = original_pil.convert('RGBA')