fixes after CR

Author: karyna-t

app/code/Magento/Backend/App/DefaultPath.php

@@ -24,8 +24,11 @@ class DefaultPath implements \Magento\Framework\App\DefaultPathInterface
      */
     public function __construct(\Magento\Backend\App\ConfigInterface $config)
     {
-        $path = $config->getValue('web/default/admin');
-        $pathParts = $path ? explode('/', $path) : [''];
+        $pathConfigValue = $config->getValue('web/default/admin') ?? '';
+        $pathParts  = [];
+        if ($pathConfigValue) {
+            $pathParts = explode('/', $pathConfigValue);
+        }
 
         $this->_parts = [
             'area' => isset($pathParts[0]) ? $pathParts[0] : '',

app/code/Magento/Backend/view/adminhtml/templates/widget/tabshoriz.phtml

@@ -19,7 +19,7 @@ use Magento\Framework\View\Helper\SecureHtmlRenderer;
     <?php foreach ($tabs as $_tab): ?>
         <?php $tabId = $block->getTabId($_tab) ?>
         <?php $_tabClass = 'tab-item-link ' . $block->getTabClass($_tab) . ' ' .
-            (preg_match('/\s?ajax\s?/', $_tab->getClass() ?? '') ? 'notloaded' : '') ?>
+            ($_tab->getClass() !== null ? (preg_match('/\s?ajax\s?/', $_tab->getClass()) ? 'notloaded' : '') : '') ?>
         <?php $_tabType = (!preg_match('/\s?ajax\s?/', $_tabClass) && $block->getTabUrl($_tab) != '#') ? 'link' : '' ?>
         <?php $_tabHref = $block->getTabUrl($_tab) == '#' ?
             '#' . $tabId . '_content' :

lib/internal/Magento/Framework/Filesystem/Driver/File.php

@@ -1060,6 +1060,10 @@ public function getRealPath($path)
      */
     public function getRealPathSafety($path)
     {
+        if ($path === null) {
+            return '';
+        }
+
         //Check backslashes
         $path = preg_replace(
             '/\\\\+/',
@@ -1074,8 +1078,8 @@ public function getRealPathSafety($path)
             $path
         );
 
-        if (!$path || strpos($path, DIRECTORY_SEPARATOR . '.') === false) {
-            return $path ? rtrim($path, DIRECTORY_SEPARATOR) : '';
+        if (strpos($path, DIRECTORY_SEPARATOR . '.') === false) {
+            return rtrim($path, DIRECTORY_SEPARATOR);
         }
 
         $pathParts = explode(DIRECTORY_SEPARATOR, $path);

lib/internal/Magento/Framework/Url.php

@@ -504,11 +504,14 @@ protected function _setRoutePath($data)
         }
 
         $this->unsetData('route_path');
-        $routePieces = $data ? explode('/', $data) : [''];
-
-        $route = array_shift($routePieces);
-        if ('*' === $route) {
-            $route = $this->_getRequest()->getRouteName();
+        $route = '';
+        $routePieces = [];
+        if (!empty($data)) {
+            $routePieces = explode('/', $data);
+            $route = array_shift($routePieces);
+            if ('*' === $route) {
+                $route = $this->_getRequest()->getRouteName();
+            }
         }
         $this->_setRouteName($route);