Status only "Available" for project model with attached projects swit…

[niksj]

fix for issue: 0000826

[ghost]

Thanks @niksj.

Seems OK to me for the code, @osarrat can you test that (or just look at the code) it's OK from a functional point of view?

[osarrat]

Thanks @niksj for this work!
Actually, on the functional point of view, your fix is not yet doing the job. Your fix is aiming to ban a shift from Draft to any target status which is not either Ready or Used. This is correct, but not enough.
I have tried your code, and if a Draft project model has a draft project created from it, when I shift its status to "Ready", it is not automatically shifted to "Available & used" as it should since a draft project is attached to it and transformed into a real project.
It is a good start but there is still some work to do on this issue ! :)