Update Store getConfig() to respect valid false return value

Using a config setting Yes/No will return string '0' when No is saved. Method will therefore fetch default config value because '0' equals false.

Author: Jeroen

app/code/Magento/Store/Model/Store.php

@@ -535,8 +535,8 @@ public function setName($name)
     public function getConfig($path)
     {
         $data = $this->_config->getValue($path, ScopeInterface::SCOPE_STORE, $this->getCode());
-        if (!$data) {
-            $data = $this->_config->getValue($path, ScopeConfigInterface::SCOPE_TYPE_DEFAULT);
+        if ($data === null) {
+            $data = $this->_config->getValue($path);
         }
         return $data === false ? null : $data;
     }