[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

missing-dep-for-interpreter make => make | build-essential | dpkg-dev (usr/*/cubicweb/skeleton/debian/rules.tmpl)