Description of problem:
Editing the name or URL of a repository results in a 400 Bad Request.

undefined method `values' for nil:NilClass

How reproducible:
always

Steps to Reproduce:
1. Create a custom product 
2. Create a repository
3. Now click on the repository edit
4. Change the name or url 
  
Actual results:
undefined method `values' for nil:NilClass
and 
Completed 400 Bad Request

Expected results:
Successful update of repo and product. 

Additional info:
The reason is because the repo id is not sent in the edit request. When we update a repo, a provider update is getting sent over without any reference to the repository getting updated.

Started POST "/providers/5" for 10.11.231.31 at Mon Jul 25 18:41:12 -0400 2011
  Processing by ProvidersController#update as HTML
  Parameters: {"repo"=>{"feed"=>"http://rgoo.com"}, "authenticity_token"=>"dUnf1zIsGIsLQNAd2k5c3QRLwsHK2bt9hy2zo7O/Q3U=", "id"=>"5"}


and


Started POST "/providers/5" for 10.11.231.31 at Mon Jul 25 18:18:28 -0400 2011
  Processing by ProvidersController#update as HTML
  Parameters: {"repo"=>{"name"=>"baz1221"}, "authenticity_token"=>"dUnf1zIsGIsLQNAd2k5c3QRLwsHK2bt9hy2zo7O/Q3U=", "id"=>"5"}

Notice in neither case is there any indication as to which repo changed.