SimpleSAML_Error_Error: Remove unused $this->cause.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@2526 44740490-163a-0410-bde0-09ae8108e29a

lib/SimpleSAML/Error/Error.php

@@ -26,12 +26,6 @@ class SimpleSAML_Error_Error extends SimpleSAML_Error_Exception {
 	private $parameters;
 
 
-	/**
-	 * The exception which caused this error.
-	 */
-	private $cause;
-
-
 	/**
 	 * Constructor for this error.
 	 *
@@ -68,8 +62,6 @@ class SimpleSAML_Error_Error extends SimpleSAML_Error_Exception {
 			$msg = $this->errorCode;
 		}
 		parent::__construct($msg, -1, $cause);
-
-		$this->cause = $cause;
 	}