270: Fixes bug 1362061 - Use actual new addons format in ThemePrettyNameRu…
…le. (#3752) * Fixes bug 1362061 - Use actual new addons format in ThemePrettyNameRule. The change to the addons field format in bug 1250132 broke the ThemePrettyNameRule rule. This commit makes that rule use the current format. * Making the Rule accept incorrectly formatted addons. * Added a better comment. * Fixed issue when the theme has no version. * Uncomment error handler.