Wt

Some signals are eagerly sent out from the framework's code, or the JS code the framework will load ad-hoc per widget.
If the signal is not connected, the WApplication will not expose them. If the signal is then emitted, and sent to the server this will result in an error being logged.

This error log is a little overeager (as an error), and may potentially lead to developers to wonder about the error (which is essentially harmless).
When such an issue is found, it can be linked to this ticket.

This ticket serves as an aggregation ticket to track all subsequent occurrences.