MOL-1294: force label to be empty string on null

src/Components/RefundManager/DAL/RefundItem/RefundItemEntity.php

@@ -175,7 +175,7 @@ public function setRefund(?RefundEntity $refund): void
      */
     public function getLabel(): string
     {
-        return $this->label;
+        return (string) $this->label;
     }
 
     /**

tests/PHPUnit/Components/RefundManager/DAL/RefundItem/RefundItemTest.php

@@ -76,5 +76,16 @@ public function testDALPayloadNoRefundIfEmpty(): void
 
         $this->assertArrayNotHasKey('refundId', $payload);
     }
+
+    /**
+     * This test verifies that no errors is thrown if the label have a null value from the database
+     * @return void
+     */
+    public function testLabelHaveEmptyValueOnNUll()
+    {
+        $refundItem = new RefundItemEntity();
+        $refundItem->label = null;
 
+        $this->assertSame('',$refundItem->getLabel());
+    }
 }