Wrappers added for RTE not treated as default content, hence wrappers split

[buuhuu]

The editor-support-rte.js script may run before decorateSections() depending on the project. In this case it will already have the consecutive paragraphs of richtext editables wrapped in <div> before the wrappers are added to the sections in decorateSections().

decorateSections() currently treats these <div> as blocks and adds new wrappers for them without a classname.