Restoring the original isset( $note_row->is_read ) condition. I bel…

…ieve it's there for notes without this property.

plugins/woocommerce/src/Admin/Notes/DataStore.php

@@ -112,7 +112,7 @@ public function read( &$note ) {
 			$note->set_date_reminder( $note_row->date_reminder );
 			$note->set_is_snoozable( (bool) $note_row->is_snoozable );
 			$note->set_is_deleted( (bool) $note_row->is_deleted );
-			$note->set_is_read( (bool) $note_row->is_read );
+			isset( $note_row->is_read ) && $note->set_is_read( (bool) $note_row->is_read );
 			$note->set_layout( $note_row->layout );
 			$note->set_image( $note_row->image );
 			$this->read_actions( $note );