(Pull Request) Error while copying a dir while cloning

Hello guys!

I was creating some subsites using your plugin and while copying from a site with multiples posts, files and pages everything went fine.

Therefore when copying from a template site only with a few configuration, appearance and plugin options occurs a error trying to copy dirs and files that don’t exist.

The full log:

[Wed Sep 17 10:35:49 2014] [error] [client 10.10.2.27] PHP Warning:  copy(/var/www/html/wordpress/wp-content/uploads/sites/13/) [<a href='function.copy'>function.copy</a>]: failed to open stream: No such file or directory in /var/www/html/wordpress/wp-content/plugins/multisite-cloner/multisite-cloner.php on line 423, referer: http://mycompany.com/wp-admin/network/site-new.php
[Wed Sep 17 10:35:49 2014] [error] [client 10.10.2.27] PHP Warning:  readdir() expects parameter 1 to be resource, boolean given in /var/www/html/wordpress/wp-content/plugins/multisite-cloner/multisite-cloner.php on line 417, referer: http://mycompany.com/wp-admin/network/site-new.php
[Wed Sep 17 10:35:49 2014] [error] [client 10.10.2.27] PHP Fatal error:  Maximum execution time of 30 seconds exceeded in /var/www/html/wordpress/wp-content/plugins/multisite-cloner/multisite-cloner.php on line 423, referer: http://mycompany.com/wp-admin/network/site-new.php

The problem was at the line 423 on a function called cloner_recurse_copy. The function tries to open a dir and then some recursive copy should be made. The problem is: there isn´t a validation code after tried to open the source dir. After a simple guard code everything worked like a charm. It is possible to add this little correction on a new plugin version?

function cloner_recurse_copy($src, $dst) {
    $dir = opendir($src); 

    // maybe I am not a dir after all.
    if(!$dir || !is_dir($dir)) {
        return;
    }

    if (!file_exists($dst)) {
        mkdir($dst);
    }

    while(false !== ( $file = readdir($dir)) ) {
        if (( $file != '.' ) && ( $file != '..' )) {
            if ( is_dir($src . '/' . $file) ) {
                cloner_recurse_copy($src . '/' . $file,$dst . '/' . $file);
            }
            else {
                copy($src . '/' . $file,$dst . '/' . $file);
            }
        }
    } 

    closedir($dir);
}

Thanks!!

https://wordpress.org/plugins/multisite-cloner/