Duplicate parameters appear in parameters dialog after using construct dialog on already loaded model.

[jhs507]

Steps to reproduce:

1. Open "Badlake.prj"
2. Open Construct Dialog
3. Click "Build"
4. Open Parameters Dialog
5. Select any module
6. Observe duplicate parameters.

The project will save correctly after performing these steps. However if the model is run than a crash will occur.

[jhs507]

Closed with ab7182a