Refpix bug fix

[penaguerrero]

This PR resolves a potential crash due to an empty list. Also added a factor to mitigate the overcorrection due to suspicious intermittently bad reference pixels.

Checklist for maintainers

• added entry in CHANGES.rst within the relevant release section
• updated or added relevant tests
• updated relevant documentation
• added relevant milestone
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below.
  How to run regression tests on a PR
• Make sure the JIRA ticket is resolved properly

[codecov]

Codecov Report

Patch coverage: 11.11% and project coverage change: -0.20 ⚠️

Comparison is base (1e4f6c5) 76.60% compared to head (851559f) 76.41%.

❗ Current head 851559f differs from pull request most recent head c09dc90. Consider uploading reports for the commit c09dc90 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7731      +/-   ##
==========================================
- Coverage   76.60%   76.41%   -0.20%     
==========================================
  Files         456      456              
  Lines       36947    36950       +3     
==========================================
- Hits        28303    28235      -68     
- Misses       8644     8715      +71     

Flag	Coverage Δ		*Carryforward flag
nightly	77.43% <ø> (-0.01%)	⬇️	Carriedforward from 8e20edb

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
jwst/refpix/refpix_step.py	73.17% <0.00%> (-2.44%)	⬇️
jwst/refpix/irs2_subtract_reference.py	67.40% <12.50%> (-19.39%)	⬇️

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[hbushouse]

Code updates look OK, but getting CI failures, because the "test_rm_intermittent_badpix.py" unit test module needs to be updated to include the new argument in the function call. Also need an update to docs for the new step argument.

[hbushouse]

Mike reported 3 datasets that caused an error for this condition. I've copied the uncal files to /grp/jwst/ssb/chartreuse/dms_bugs/jp-3157/ for testing purposes (to see if this PR avoids the error).

[penaguerrero]

Added documentation, fixed test, and tested with data from central store. All good from my end.

[hbushouse]

Regression test run started at https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/786

[hbushouse]

Regression test results show minor differences in pixel values starting with and downstream from the refpix step, which I'm assuming are expected differences due to this change. No errors of any kind.