Fix handling of 404 file search

tools.py

@@ -193,8 +193,10 @@ class APIProcessor:
         Returns:
             Parsed text output of the attachment
         """
+        if not self.file_name:
+            return "No attached file for this question"
+
         response = requests.get(self.file_url, timeout=15)
-        response.raise_for_status()
 
         file_extension = self.file_name.split(".")[-1]