The default implementation of ExceptionFormatter which is used by Session's
IMessageHandler (MessagePanel) if another one isn't specified by a plugin.
Also, if a custom ExceptionFormatter is stored
author: manningr
setCustomExceptionFormatter(ExceptionFormatter customFormatter) Sets the custom ExceptionFormatter to delegate calls to format to if the
custom formatter formats the exception.
Parameters: customFormatter - the ExceptionFormatter to delegate calls to.
Sets the custom ExceptionFormatter to delegate calls to format to if the
custom formatter formats the exception.
Parameters: customFormatter - the ExceptionFormatter to delegate calls to. If one has already been set, this will have no effectexcept logging an error message.