ISTWCMS-5709: fixing undefined value error

src/Service/UwNodeFieldValue.php

@@ -650,13 +650,9 @@ class UwNodeFieldValue {
    */
   public function getAuthor(Node $node): array {
 
-    // Get the author field from the node, if there is
-    // no author specified the value will be NULL.
-    $author_name = $node->field_author->value;
-
     // If there is no author in the field, get the owner
     // of the blog post.
-    if (!$author_name) {
+    if (!$node->field_author) {
 
       // Set the author to the person who made blog.
       $author = [
@@ -670,7 +666,8 @@ class UwNodeFieldValue {
       // Get the link field from the node.
       $link = $node->field_uw_author_link->getValue();
 
-      $author['name'] = $author_name;
+      // Get the auther name from the node.
+      $author['name'] = $node->field_author->value;
 
       if (!empty($link)) {
         $author['link'] = $link[0]['uri'];