Bug fix/restool/issue 500 #2

[H4wKs]

Q	A
Branch ?	Master
Bug Fix ?	Yes
New feature ?	No
Deprecation ?	No
Tickets	Fix #500 #506
Licence	MIT

This PR fix the (Warning: Invalid argument supplied for foreach() in RestTool.php (line 379)) warning triggered in RestTool.php as stated in issue #500 and #506

This happen when $error->Errors is null while foreach expect an array. Add a cast (array) seem's to be a clean way to fix this.

Code Before

        foreach ($error->Errors as $key => $val) {
            $error->Message .= sprintf(' %s error: %s', $key, $val);
        }

Code After

        foreach ((array) $error->Errors as $key => $val) {
            $error->Message .= sprintf(' %s error: %s', $key, $val);
        }

Feedback welcome :)