Commit message says "Every existing use of this function will return better data if the system defaults are included."
I beg to differ :) I see two usages, one in calculateAppliedStyle in Formatting and one in OdtDocument.getParagraphStyleAttributes.
For the first I would agree the system default should be included, surprised it is not yet, so seems good to fix this.
For the latter at least by the usages the system default should not be included (needs to be made more clear in the API dox that it's just the doc's default, without the system ones), because currently the style editor would copy system defaults into styles, which IMHO is not good. Also filed #330 for related issues with the dialog.

So please also pass false for the flag in OdtDocument.getParagraphStyleAttributes.