[BUG] errors hidden in sample generation

[ymubarka]

🐛 Bug Report

Describe the bug Errors don't show up while generating samples

To Reproduce Steps to reproduce the behavior:

1. Uninstall merlin-spellbook
2. run the optimization_basic example
3. It shows that samples were generated but then it doesn't find them

Expected behavior An error should be raised if there was an issue with creating the samples

Please answer these questions to help us pinpoint the problem

• Does the problem occur in merlin run --local mode, distributed mode or neither? It occurs in --local