[web/data] Never hide JS errors in our Deferred implementation
Modern browsers have good debugging tools, let exceptions go all the way
up. This only affects exceptions raised in the js code, if there's an
issue on the server/python side, they'll keep going through our error
callbacks.
Closes #4881300
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html