Comment 8 for bug 1136890

ControllerEngineConnectionScriptValue(name = "")

is returned by engine.connectControl only when setting hooks, and it seems to always return that text string whether the hook set was successful or not.

When clearing hooks using engine.connectControl(..., true), it seems that true is returned whether the connection is cleared successfully or not - even if a 'Warning [Controller]: could not disconnect connection "myfunction"' error is displayed.