Fix edit-time and infinte loop.

[lkhphuc]

Hi, thanks a lot for the script. I found some error while converting mine database so I figure I would submit a PR.

The first one is the location of 'edit-time'. In some of my page, it's inside the page['children'][0] dict, in some other page it is directly in the page dict. I add a small if else around that.

The second one is infinite loop when reference not found. I haven't dig around the logic around that part yet but just add a break statement seems to work fine for me.

Hope this help.

[jcmoreland]

Thanks for the break in the uid check. I also needed an empty dict return in the scan method to deal with no 'uid' found.