magento2: Product resource getAttributeRawValue function does not return anything if there is no default value

Preconditions

1. Magento 2.2.4
2. PHP 7.1.17

Steps to reproduce

1. Create a storeview EN
2. Create a storeview FR
3. Create a dropdown attribute with some values
4. Change this attribute value on EN view
5. Use getAttributeRawValue() to retrieve it, ie

$product->getResource()->getAttributeRawValue($product->getId(), 'attribute_code', $this->_storeManager->getStore()->getId());

Expected result

1. Value is returned

Actual result

1. No value is returned because there is no value in default store (store 0).