Recognize solver TerminationCondition.error as no usable solution (#801)

sputils.not_good_enough_results now also treats
TerminationCondition.error (a solver error, not just infeasible or
unbounded) as "no usable solution," so callers detect a failed solve
consistently.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: DLWoodruff

mpisppy/utils/sputils.py

@@ -79,6 +79,7 @@ def not_good_enough_results(results):
         (results.solution(0).status == SolutionStatus.unknown) or \
         (results.solver.termination_condition == TerminationCondition.infeasible) or \
         (results.solver.termination_condition == TerminationCondition.infeasibleOrUnbounded) or \
+        (results.solver.termination_condition == TerminationCondition.error) or \
         (results.solver.termination_condition == TerminationCondition.unbounded)