Drupal 7 Notice: "Undefined index: name in system_requirements() (line 39 of ..."

If the following error: "Undefined index: name in system_requirements() (line 39 of ..." occurs in your Drupal environment (status page, errorlog or whatever), here's the solution how to fix it:

It seems that there is a problem with old install profiles:
Search for the name of your install profile (can be found in the "Status Report", Second line of the table) in the DB "system"-table and set status to "1" for it!

Or via SQL (check the name before!)
UPDATE system SET status = 1 where name = "YOUR_INSTALL_PROFILE_NAME";
YOUR_INSTALL_PROFILE_NAME may be replaced by "custom", "demo_profile", "commerce" or whatever you used to install your site!

Found here:
http://drupal.org/node/1116340#comment-7419726

Another solution is described here, but I think it does not solve the problem but just the message and requires to hack core (UGLY!): ;)
http://www.drupaldeveloper.es/en/notice-undefined-index-name-in-system-r...