Report unexpected character data as error from the GMarkup parser,

Report unexpected character data as error from the GMarkup parser,

2003-09-17  Matthias Clasen  <maclas@gmx.de>

	* gtk/gtkuimanager.c (text_handler): Report unexpected character
	data as error from the GMarkup parser, otherwise things like
	gtk_ui_manager_add_ui_from_string (ui, "Hi there!", -1, &error)
	pass unexpectedly.