Add logs to debug crbug.com/340201616 (#3994)

Author: paulsemel

src/clusterfuzz/_internal/bot/webserver/http_server.py

@@ -95,6 +95,7 @@ def do_GET(self):  # pylint: disable=invalid-name
     """Handle a GET request."""
     absolute_path = get_absolute_testcase_file(self.path)
     if not absolute_path:
+      logs.log_warn(f"Could not find an absolute path for {self.path}.")
       self.send_response(404)
       self.end_headers()
       return