russian utf8 encoded software name

hello!

it is some problem in displaying software names when non ascii names are used - fields with non-ascii symbols are blank. records in database is ok.

in apache err.log i see:    PHP Warning:  json_encode(): Invalid UTF-8 sequence in argument in /usr/share/ocsinventory-reports/ocsreports/require/function_table_html.php on line 2147, referer: http://10.128.20.50/ocsreports/?function=visu_computers