Linalg errors with insufficient data

[jmafoster1]

Describe the bug
When we have insufficient data, we can get errors numpy.linalg.LinAlgError: SVD did not converge

To Reproduce
From the causal test adequacy repo, go to case-study-3 and run "bash rq3.sh 10". It'll get most of the way through, and then crash out with the error. If you don't see it, let me know and I'll send you the parquet file of the data I used.

Expected behavior
Honestly, I'm not really sure how best to handle this. The test should definitely fail, but this will need to be wrapped up in a causal test outcome, which might be annoying to implement.

Desktop (please complete the following information):

• OS: I use Ubuntu, but it will fail on anything.
• Version: test-adequacy branch