Fix bug when checking for "target" in model.asn

[mairanteodoro]

This PR fixes a bug when checking for the attribute "target" in model.asn.

Since model.asn is not a dict (it is an instance of the MappingProxy class), usinghasattr() will not work because that object doesn't have attributes accessible via that function.

Regression tests

• https://github.com/spacetelescope/RegressionTests/actions/runs/11729059583

Tasks

• request a review from someone specific, to avoid making the maintainers review every PR
• add a build milestone, i.e. 24Q4_B15 (use the latest build if not sure)
• Does this PR change user-facing code / API? (if not, label with no-changelog-entry-needed)
  • write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see below for change types)
  • update or add relevant tests
  • update relevant docstrings and / or docs/ page
  • start a regression test and include a link to the running job (click here for instructions)
    • Do truth files need to be updated ("okified")?
      • after the reviewer has approved these changes, run okify_regtests to update the truth files
• if a JIRA ticket exists, make sure it is resolved properly

news fragment change types...

• changes/<PR#>.general.rst: infrastructure or miscellaneous change
• changes/<PR#>.docs.rst
• changes/<PR#>.stpipe.rst
• changes/<PR#>.associations.rst
• changes/<PR#>.scripts.rst
• changes/<PR#>.mosaic_pipeline.rst
• changes/<PR#>.patch_match.rst

steps

• changes/<PR#>.dq_init.rst
• changes/<PR#>.saturation.rst
• changes/<PR#>.refpix.rst
• changes/<PR#>.linearity.rst
• changes/<PR#>.dark_current.rst
• changes/<PR#>.jump_detection.rst
• changes/<PR#>.ramp_fitting.rst
• changes/<PR#>.assign_wcs.rst
• changes/<PR#>.flatfield.rst
• changes/<PR#>.photom.rst
• changes/<PR#>.flux.rst
• changes/<PR#>.source_detection.rst
• changes/<PR#>.tweakreg.rst
• changes/<PR#>.skymatch.rst
• changes/<PR#>.outlier_detection.rst
• changes/<PR#>.resample.rst
• changes/<PR#>.source_catalog.rst

[ddavis-stsci]

Interesting, I wonder why that fixed the issue locally.
pytest romancal/resample/tests/test_resample_step.py
...
= 44 passed, 24 warnings in 2.82s =

[ddavis-stsci]

Looks fine to me

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.21%. Comparing base (78d5e0f) to head (363ee11).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1502      +/-   ##
==========================================
+ Coverage   76.20%   76.21%   +0.01%     
==========================================
  Files         115      115              
  Lines        7631     7631              
==========================================
+ Hits         5815     5816       +1     
+ Misses       1816     1815       -1     

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