Fix meta title property

Author: slackerzz

lib/internal/Magento/Framework/View/Page/Config.php

@@ -117,6 +117,7 @@ class Config
         'description' => null,
         'keywords' => null,
         'robots' => null,
+        'title' => null,
     ];
 
     /**

lib/internal/Magento/Framework/View/Page/Config/Renderer.php

@@ -136,6 +136,12 @@ public function renderMetadata()
     protected function processMetadataContent($name, $content)
     {
         $method = 'get' . $this->string->upperCaseWords($name, '_', '');
+        if($name === 'title') {
+            if (!$content) {
+                $content = $this->escaper->escapeHtml($this->pageConfig->$method()->get());
+            }
+            return $content;
+        }
         if (method_exists($this->pageConfig, $method)) {
             $content = $this->pageConfig->$method();
         }