load bug with y name different than output_var

[wd60622]

Description

Found this while making the tests use mocked pm.sample

If y already has a name, then load_from_idata method would raise a KeyError

Related Issue

• Closes #
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass. Feel free to comment pre-commit.ci autofix to auto-fix.
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks) using numpydoc format.
• If you are a pro: each commit corresponds to a relevant logical change

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📚 Documentation preview 📚: https://pymc-marketing--1468.org.readthedocs.build/en/1468/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.75%. Comparing base (0eb7841) to head (e866c0e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1468      +/-   ##
==========================================
+ Coverage   94.68%   94.75%   +0.07%     
==========================================
  Files          50       50              
  Lines        5457     5456       -1     
==========================================
+ Hits         5167     5170       +3     
+ Misses        290      286       -4     

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[juanitorduz]

Thank @wd60622

[juanitorduz]

We have some failing tests

FAILED tests/mmm/test_mmm.py::TestMMM::test_get_group_predictive_data[scaled-prior_predictive] - RuntimeError: Make sure the model has been fitted and the prior_predictive has been sampled!
FAILED tests/mmm/test_mmm.py::TestMMM::test_get_group_predictive_data[scaled-posterior_predictive] - assert 10 == 500
FAILED tests/mmm/test_mmm.py::TestMMM::test_get_group_predictive_data[original-scale-prior_predictive] - RuntimeError: Make sure the model has been fitted and the prior_predictive has been sampled!
FAILED tests/mmm/test_mmm.py::TestMMM::test_get_group_predictive_data[original-scale-posterior_predictive] - assert 10 == 500