`if_apc_wsp_event_handler$on_error` must pass `I_REASON`

[larshp]

https://github.com/open-abap/open-abap-core/blob/main/src/tcp/cl_apc_tcp_client_manager.clas.locals_imp.abap#L67

[larshp]

workaround added to show error in console, #939

promises... baa