another fix for ATLASSIM-5596

Petr Balekrequested to merge
pbalek/athena:another-fix-ATLASSIM-5596 into master

The problem of reading from beyond the vector range in AFP_Geometry::getSIDTransform wasn't fully fixed by !50006 (merged), unfortunately. This merge request should address that.

Closes ATLASSIM-5596, this time for real.

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