Rx vigilance - empty DDI case fix

app/Helpers/fdb.php

@@ -332,12 +332,12 @@ if(!function_exists('drug_drug_interaction_info_with_pivot')) {
             $output[] = drugDrugInteractionSinglePair($_pivot, $_drugs[$i]);
         }
 
-        if(!count($output)) return '';
-
         $output = array_filter($output, function($_x) {
             return !!$_x;
         });
 
+        if(!count($output)) return '';
+
         return "<ol class='pl-0 ml-3 mb-0'>" . implode("", array_map(function ($_x) {
                 return "<li class='mb-1'>" . $_x . "</li>";
             }, $output)) . "</ol>";