Description:
------------
There is a DomException in the documentation of Dom->importNode(), but it returns FALSE on fail without a reason.

Reproduce code:
---------------
/**
	 * Import node to dom
	 * 
	 * @param   DomElement  node which will be imported
	 * @param   boolean     deep (use recursive importing - default TRUE)
	 * @return  DomElement  reference to created node
	 */
	public function domImportNode($node, $deep = TRUE) {
		if (FALSE === ($sxe = $this->dom->importNode($node, $deep))) {
		    throw new Exception('importNode failed.');
		}
		
		$sxe = $this->dom->appendChild($sxe);
		return $sxe;
	}

Expected result:
----------------
DomException

Actual result:
--------------
My Exception