Disclosure: I don't know much about how the package model in Sublime works.
TLDR: Just try installing the Anaconda plugin and try editing preferences for it. SublimePreferencesEditor is unable to discover the default preferences available for that package.
Basic analysis: Anaconda's default settings file is located at Data\Packages\Anaconda\Anaconda.sublime-settings, unlike most other plugins wherein the settings file is inside the sublime-package file itself. Maybe SublimePreferencesEditor is not looking there?