Re-opening project enables Python kit

Steps to reproduce:

• start QC with a clean settings path / non-existing directory
  e.g. qtcreator -settingspath /tmp/testing/narf
• Link with Qt to have multiple Qt versions and Kits registered, restart with same settings path
• create a project from template (I've used qmake based Qt Widget App)
• build it with a configured kit, maybe enable further kits and build (I had 3 different Qt kits)
• close QC
• remove the .user file of the project file
• open QC again with the same settings path, open the project

Current result:

• all former kits are enabled again, inside is a folder marked as "(imported)" - nice
• the default Python kit is also enabled (folder of one of the other kits, also marked as "(imported)"