Refactor:remove useless try catch for ppt parser (#12063)

### What problem does this PR solve?

remove useless try catch for ppt parser

### Type of change
- [x] Refactoring

deepdoc/parser/ppt_parser.py

@@ -88,12 +88,9 @@ class RAGFlowPptParser:
             texts = []
             for shape in sorted(
                     slide.shapes, key=lambda x: ((x.top if x.top is not None else 0) // 10, x.left if x.left is not None else 0)):
-                try:
-                    txt = self.__extract(shape)
-                    if txt:
-                        texts.append(txt)
-                except Exception as e:
-                    logging.exception(e)
+                txt = self.__extract(shape)
+                if txt:
+                    texts.append(txt)
             txts.append("\n".join(texts))
 
         return txts