"Clear model" not working

[atredennick]

On the edits_ACT version of the package, the "Clear model" button is not working after I load a premade model.

To reproduce:

1. Load a model
2. Analyze the model
3. Hit clear button on "Main" tab
4. Model still exists in the "Build" tab

[JoeZientek]

@atredennick This has been resolved (see commit 7003506)