[Incoming] unnecessary div returned preventing further reuse of results

[IRA1777]

Setup

• SRF version: 3.1.0

Issue

Incoming format returns unnecessary div that prevent further data processing.
getFormatOutput function add it in the "Beautify class selector" section.

Steps to reproduce
Put a query result of format "incoming" in a variable.
Try to manipulate the variable: it never has the expected behaviour -> returned value contains html elements.