fix: The doc file cannot be parsed(#11092) (#11093)

### What problem does this PR solve?

The doc file cannot be parsed(#11092)

### Type of change

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

Co-authored-by: virgilwong <hyhvirgil@gmail.com>

rag/app/naive.py

@@ -724,8 +724,15 @@ def chunk(filename, binary=None, from_page=0, to_page=100000,
     elif re.search(r"\.doc$", filename, re.IGNORECASE):
         callback(0.1, "Start to parse.")
 
+        try:
+            from tika import parser as tika_parser
+        except Exception as e:
+            callback(0.8, f"tika not available: {e}. Unsupported .doc parsing.")
+            logging.warning(f"tika not available: {e}. Unsupported .doc parsing for {filename}.")
+            return []
+
         binary = BytesIO(binary)
-        doc_parsed = parser.from_buffer(binary)
+        doc_parsed = tika_parser.from_buffer(binary)
         if doc_parsed.get('content', None) is not None:
             sections = doc_parsed['content'].split('\n')
             sections = [(_, "") for _ in sections if _]