[testselect] KeyError in equivalence_sets[group] #5577 fix #5594
+31
−1
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Added a check in select_configs to handle groups missing from precomputed equivalence sets. If a group isn't found, generate its equivalence sets on-the-fly using the same logic as _get_equivalence_sets, preventing KeyError for newly discovered groups (e.g., from find_manifests_for_paths).