Trace file not created when program ends unexpectedly

**Describe the bug**
If I run `pdl --trace trace.json examples/chatbot/chatbot.pdl` and terminate with control-C or control-D I do not get a trace file generated.

**To Reproduce**
Run the above and terminate using a signal rather than input of "yes"

**Expected behavior**
The trace file should be generated if the user terminates the program.
