Remove empty constructor

Signed-off-by: Kamil Tekiela <tekiela246@gmail.com>

Author: kamil-tekiela

src/Components/CaseExpression.php

@@ -66,10 +66,6 @@ final class CaseExpression implements Component
      */
     public $expr = '';
 
-    public function __construct()
-    {
-    }
-
     /**
      * @param Parser               $parser  the parser that serves as context
      * @param TokensList           $list    the list of tokens that are being parsed