fix(export): change conditional to !empty to pass static analysis

Author: fran

inc/common.class.php

@@ -1310,7 +1310,7 @@ public static function generateOdt($params)
             } else {
                 $singledatas->setVars('datas_title', mb_strtoupper(__s('data', 'mreporting')), false, 'utf-8');
                 foreach ($datas as $key => $value) {
-                    if (isset($singledatas->datas) || $singledatas->datas !== null) {
+                    if (!empty($singledatas->datas)) {
                         $singledatas->datas->row($key, ENT_NOQUOTES, 'utf-8');
                         $singledatas->datas->value($value, ENT_NOQUOTES, 'utf-8');
                         $singledatas->datas->merge();