Eradicate is file checks for our rrds (leave them for nfsen and collectd)

html/includes/graphs/application/tinydns_dnssec.inc.php

@@ -39,7 +39,7 @@ $array    = array(
 $colours  = 'mixed';
 $rrd_list = array();
 
-if (is_file($rrd_filename)) {
+if (rrdtool_check_rrd_exists($rrd_filename)) {
     foreach ($array as $ds) {
         $rrd_list[$i]['filename'] = $rrd_filename;
         $rrd_list[$i]['descr']    = strtoupper($ds);