More verbose errors on rule names in conversion.

Thanks to Laimis

See for details https://sourceforge.net/p/cmusphinx/bugs/403/



git-svn-id: svn+ssh://svn.code.sf.net/p/cmusphinx/code/trunk/sphinxbase@12669 94700074-3cef-4d97-a70e-9c8c206c02f5