At least one local run required

[JannisNe]

Describe the bug
Sometimes if only run on the cluster, there seems to be a problem with dealing with sparse matrices. One local run can circumvent that

To Reproduce
Steps to reproduce the behavior:

1. Run 'flare stack/analyses/skylab_crosscheck/calculate_skylab_sensitivity.py'
2. Set sin(dec) to 0.25 and run in the cluster
3. See error:
   57164053_stderr.txt

Expected behavior
No error.

[robertdstein]

Caused (I think) by race conditions, and possible linked to #7