Fix: paddle ocr missing outlines (#13441)

### What problem does this PR solve?

Fix: paddle ocr missing outlines #13422

### Type of change

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

deepdoc/parser/paddleocr_parser.py

@@ -199,6 +199,7 @@ class PaddleOCRParser(RAGFlowPdfParser):
         """Initialize PaddleOCR parser."""
         super().__init__()
 
+        self.outlines = []
         self.api_url = api_url.rstrip("/") if api_url else os.getenv("PADDLEOCR_API_URL", "")
         self.access_token = access_token or os.getenv("PADDLEOCR_ACCESS_TOKEN")
         self.algorithm = algorithm