Check for href in isEmpty(), rather than URL closes #73

Author: yandodov

src/Link.php

@@ -129,9 +129,9 @@ public function tag($attr = [])
 
 	public function isEmpty()
 	{
-		return $this->url() === null;
+		return $this->href() === null;
 	}
-	
+
 	public function isNotEmpty()
 	{
 		return !$this->isEmpty();