Issue #3269302 by sgostanyan, h1nds1ght: Deprecated function : trim() with PHP 8.1

src/Plugin/Field/FieldType/TimeRangeType.php

@@ -68,8 +68,8 @@ class TimeRangeType extends FieldItemBase {
    * {@inheritdoc}
    */
   public function isEmpty() {
-    $from = $this->get('from')->getValue();
-    $to = $this->get('to')->getValue();
+    $from = $this->get('from')->getValue() ?? '';
+    $to = $this->get('to')->getValue() ?? '';
     return trim($from) === '' || trim($to) === '';
   }
 

src/Plugin/Field/FieldType/TimeType.php

@@ -83,7 +83,7 @@ class TimeType extends FieldItemBase {
    * {@inheritdoc}
    */
   public function isEmpty() {
-    $value = $this->get('value')->getValue();
+    $value = $this->get('value')->getValue() ?? '';
     return trim($value) === '';
   }