Put console messages before delete call.

Wrap each product's delete call in a try catch to trap access
permissions problems (seems to happen with Revi 2015).
Change 2 Dynamo install const names.
Updates to test paths.

We were off by one on our test paths. The error noticed by ritesh was an
error to find the .dyn file, not the model file (whose path is shown in
the RTF UI and will highlight green or red depending on whether the
model file path exists)