[hooks/syncschema] avoid altering a dropped table
If the constraint's rdef is being removed, CWConstraintDelOp doesn't
need to do anything. Otherwise it may try to alter a removed
table/column. Closes #4154549
sync_schema_props_perms('EmailAddress')
for source in rql('CWSource X WHERE X type "ldapuser"').entities():
config = source.dictconfig
host = config.pop('host', u'ldap')
protocol = config.pop('protocol', u'ldap')
source.cw_set(url=u'%s://%s' % (protocol, host))
source.update_config(skip_unknown=True, **config)
commit()