This MR concerns only new JO menu integration. It changes behaviour in case of an error in signatures code. Now the issue is propagated upstream. Before there only a warning printed + the stack trace was missing. It became impossible to do any debugging with it. Another modified aspect was that if certain signature is not configured (i.e. list of chains is == []) respective signature code is not imported at all. I think @fpastore was asking for this fix long time ago already. Tagging @kjamrog