[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.
"""pre 3.6 bw compat"""
# pylint: disable-msg=W0614,W0401
from warnings import warn
warn('moved to cubicweb.tags', DeprecationWarning, stacklevel=2)
from cubicweb.tags import *