Detect Nan and Inf in merit function based line search #1166
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This PR adds Nan and Inf detection in merit function based line search. If Nan/inf is encountered during the evaluation of the merit function, the step size is decreased. If Nan/inf is encountered during the early termination check, no second-order corrections are performed.
Follow-up: backtrack if new linearization results in NaN or infeasible QP.