Bug updating instance attributes

[icot]

The wrong update method is being used when updating attributes by name, which results in an error not finding the attribute to modify

[DEBUG 17/Aug/2018:10:23:33 +0000 attribute:208] 0 20 * * 6
[DEBUG 17/Aug/2018:10:23:33 +0000 attribute:215] BODY: 0 20 * * 6
[DEBUG 17/Aug/2018:10:23:33 +0000 connectionpool:205] Starting new HTTP connection (1): localhost:3000
[DEBUG 17/Aug/2018:10:23:33 +0000 connectionpool:393] http://localhost:3000 "POST /rpc/update_instance_at
tribute HTTP/1.1" 500 None
[ERROR 17/Aug/2018:10:23:33 +0000 attribute:222] Error updating the instance 1458 attribute: {"hint":"Att
ribute not found","details":null,"code":"P0001","message":"Attribute not found <NULL>"}