Could not export project to github after renaming the already existing project there

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Assuming you have project "foo" on google code
2. and you have project "foo" on github
3. following the FAQ, rename github project "foo" to "bar"
4. Try to export google code project "foo" to github
5. This fails with "The error is as follows: github.com/yourname/foo already 
exists"

What is the expected output? What do you see instead?

This should work according to the FAQ 
https://code.google.com/p/support-tools/wiki/GitHubExporterFAQ#Error_"Project_al
ready_exists."

I experienced this issue with 
https://code.google.com/p/memcached-session-manager/ and 
https://github.com/magro/memcached-session-manager (which I had renamed to 
https://github.com/magro/memcached-session-managerx) - not that after renaming 
https://github.com/magro/memcached-session-manager to 
https://github.com/magro/memcached-session-managerx github redirects requests 
from the former url to the new url.

Original issue reported on code.google.com by martin.grotzke on 23 Aug 2015 at 9:31