transfer error handler

Transfer project to group which already has project with such name

![bug1](https://cloud.githubusercontent.com/assets/1488195/5436491/f6beabee-8477-11e4-9b44-cde94ca27080.png)

this popup doesn't disappear and there isn't any error message
fix to
![fix1](https://cloud.githubusercontent.com/assets/1488195/5436518/3e0bcb6c-8478-11e4-9501-2a0545e76085.png)