Fix: docx get image exception. (#7636)

### What problem does this PR solve?

Close #7631

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/app/naive.py

@@ -60,6 +60,9 @@ class Docx(DocxParser):
         except InvalidImageStreamError:
             logging.info("The recognized image stream appears to be corrupted. Skipping image.")
             return None
+        except UnicodeDecodeError:
+            logging.info("The recognized image stream appears to be corrupted. Skipping image.")
+            return None
         try:
             image = Image.open(BytesIO(image_blob)).convert('RGB')
             return image