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Fix undefined variable in openmc.mgxs.library (scatt_mgxs)#3943

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hugo-barthod:fix-scatt_matrix
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Fix undefined variable in openmc.mgxs.library (scatt_mgxs)#3943
hugo-barthod wants to merge 2 commits into
openmc-dev:developfrom
hugo-barthod:fix-scatt_matrix

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Description

In openmc.mgxs.library, lines 1286-1292 suggest it okay to build a multigroup library from only a scatter matrix (ie without multiplicity being accounted for).
However when reaching these lines, scatt_mgxs was undefined variable and raised error.
This PR defines scatt_mgxs in this case.

Checklist

  • I have performed a self-review of my own code
  • I have run clang-format (version 18) on any C++ source files (if applicable)
  • I have followed the style guidelines for Python source files (if applicable)
  • I have made corresponding changes to the documentation (if applicable)
  • I have added tests that prove my fix is effective or that my feature works (if applicable)

@GuySten GuySten added the Bugs label May 26, 2026
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