Error while parsing a project with no qMake build steps

The following procedure reproduces the error:

1. Open Qt Creator 2.8.1

2. Create non-QtProject>Plain C++ Project

3. Give a name and choose a directory

4. choose the standard options (debug and release)

5. Choose no control version (just click done)

On the qt interface:

6. Go to tab "project"

7. Remove qmake build step in "debug" (for instance when you just want to use make)

8. Remove qmake build step in "release" (for instance when you just want to use make)

After 8., a general message appears saying "Error while parsing file ...teste.pro. Giving up."

9. Switch back to the tab "edit". The project will no longer have any of the files on the Qt: as the message says, error in parsing.

I found this after I installed the new Qt (I was using 2.6) and I tried to use it on a project where I don't need Qmake: where I only use make.

I thus do not confirm that a first installation of a Qt Creator on my OS would reproduce this error.