Merge pull request #1734 from FHenry/3.5

Fix

htdocs/core/class/cookie.class.php

@@ -91,8 +91,10 @@ class DolCookie
 			$num = (count($this->cookiearray) - 2);
 			for ($f = 0; $f <= $num; $f++)
 			{
+				if (!empty($this->myKey)) {
 					$this->myValue .= strval(chr($this->cookiearray[$f]/$this->myKey));
 				}
+			}
 
 			return(base64_decode($this->myValue));
 		}