Respect empty paragraphs on restore & save

## Expected results
If an author adds extra paragraphs for organizational reasons, DA should maintain them unless they negatively affect the AEM Markup Pipeline.

## Actual results
Empty paragraphs are all over the map with how they are created, restored, and saved.

No files, tests, or entry points are named. Reproduce an author adding extra empty paragraphs, then trace restore and save behavior and the AEM Markup Pipeline boundary; done means organizational empty paragraphs are preserved unless the pipeline rejects them.

Written by the indexing model from the issue text.