fix: empty vat in article

src/QUI/ERP/Accounting/Article.php

@@ -126,8 +126,10 @@ public function __construct($attributes = array())
             $this->attributes['quantity'] = $attributes['quantity'];
         }
 
-        if (isset($attributes['vat'])) {
+        if (isset($attributes['vat']) && $attributes['vat'] !== '') {
             $this->attributes['vat'] = $attributes['vat'];
+        } else {
+            $this->attributes['vat'] = '';
         }
 
         if (isset($attributes['discount'])) {
@@ -241,7 +243,7 @@ public function getSum()
      */
     public function getVat()
     {
-        if (isset($this->attributes['vat'])) {
+        if (isset($this->attributes['vat']) && $this->attributes['vat'] !== '') {
             return (int)$this->attributes['vat'];
         }
 
@@ -397,10 +399,10 @@ public function calc($Instance = null)
      */
     public function toArray()
     {
-        $vat      = false;
+        $vat      = '';
         $discount = '';
 
-        if (isset($this->attributes['vat'])) {
+        if (isset($this->attributes['vat']) && $this->attributes['vat'] !== '') {
             $vat = (int)$this->attributes['vat'];
         }
 

src/QUI/ERP/User.php

@@ -90,7 +90,7 @@ public function __construct(array $attributes)
             }
         }
 
-        $this->id        = (int)$attributes['id'];
+        $this->id        = $attributes['id'];
         $this->isCompany = (bool)$attributes['isCompany'];
 
         $this->lang      = $attributes['lang'];