[web] fix #724769: Use RemoteCallFailed in the publisher's error_handler
On json_request, errors handled by the publisher should raise RemoteCallFailed
exceptions instead of standard StatusResponse so that errbacks get called
normally on the client side.
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