Use maybe* methods

Co-authored-by: Cédric Anne <cedric.anne@gmail.com>

inc/stat.class.php

@@ -749,7 +749,7 @@ class Stat extends CommonGLPI {
 
       $criteria = [];
       $WHERE = [];
-      if ($DB->fieldExists($table, 'is_deleted')) {
+      if ($item->maybeDeleted()) {
          $WHERE["$table.is_deleted"] = 0;
       }
       $WHERE += getEntitiesRestrictCriteria($table);
@@ -1938,4 +1938,3 @@ class Stat extends CommonGLPI {
       return "fas fa-chart-bar";
    }
 }
-

inc/state.class.php

@@ -120,10 +120,10 @@ class State extends CommonTreeDropdown {
             } else {
                $table = getTableForItemType($itemtype);
                $WHERE = [];
-               if ($DB->fieldExists($table, 'is_deleted')) {
+               if ($item->maybeDeleted()) {
                   $WHERE["$table.is_deleted"] = 0;
                }
-               if ($DB->fieldExists($table, 'is_template')) {
+               if ($item->maybeTemplate()) {
                    $WHERE["$table.is_template"] = 0;
                }
                $WHERE += getEntitiesRestrictCriteria($table);