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There could be several reasons why the output of parsing html text from a content node using libxml++ is coming out as empty:

1. The HTML text may not be structured correctly, causing the parsing to fail. Make sure that the HTML text is valid and properly formatted.

2. The content node may not be correctly identified by the parser. Ensure that you are passing in the correct node or correct path to the node containing the HTML text.

3. The parser may be set up incorrectly. Check that you have initialized the parser properly and that all necessary options and flags have been set.

4. The output stream may be misconfigured. Ensure that the output stream is set up correctly and that data is being written to it.

5. There may be an issue with the version of libxml++ being used. Make sure that you are using the latest version of the library and that it is installed correctly.

6. There may be an issue with the platform or environment being used. Check that there are no compatibility issues with the operating system or other system libraries.

7. The HTML text may be encoded in a format that the parser does not support. Make sure that the encoding used in the HTML text is recognized by the parser.