Check if cookie exist before purge

tarteaucitron.js

@@ -1534,9 +1534,13 @@ var tarteaucitron = {
             var i;
 
             for (i = 0; i < arr.length; i += 1) {
-                document.cookie = arr[i] + '=; expires=Thu, 01 Jan 2000 00:00:00 GMT; path=/;';
-                document.cookie = arr[i] + '=; expires=Thu, 01 Jan 2000 00:00:00 GMT; path=/; domain=.' + location.hostname + ';';
-                document.cookie = arr[i] + '=; expires=Thu, 01 Jan 2000 00:00:00 GMT; path=/; domain=.' + location.hostname.split('.').slice(-2).join('.') + ';';
+
+                var rgxpCookie = new RegExp("^(.*;)?\\s*" + arr[i] + "\\s*=\\s*[^;]+(.*)?$");
+                if (document.cookie.match(rgxpCookie)) {
+                    document.cookie = arr[i] + '=; expires=Thu, 01 Jan 2000 00:00:00 GMT; path=/;';
+                    document.cookie = arr[i] + '=; expires=Thu, 01 Jan 2000 00:00:00 GMT; path=/; domain=.' + location.hostname + ';';
+                    document.cookie = arr[i] + '=; expires=Thu, 01 Jan 2000 00:00:00 GMT; path=/; domain=.' + location.hostname.split('.').slice(-2).join('.') + ';';
+                }
             }
         },
         "checkCount": function (key) {