Error when creating CMake project without suitable kit.

Steps to reproduce:

• open a creator without any kits configured
• open: File -> New File or Project
• choose Non-Qt Project - Plain C Project (CMake Build)
• finish the first wizard -> second Wizard appears telling that Qt Creator has no suitable kits
• cancel the second wizard

Current behavior:

• error pops up (see screenshot)
• project files are created, although the project wizard was cancelled

Expected behavior:

• just one wizard pops up
• project files aren't created upon cancel