Fix treatment of redundant Lagrange multiplier
The attached file contains a redundant equation junk=junk
that results in Lagrange multiplier 19 not being present at all. That causes a crash in stochastic_solvers
due to M_.lead_lag_incidence
containing a column of zeros. In contrast to other cases, we do not provide a preprocessing error. For example
0*junk=0;
will result in
Starting preprocessing of the model file ... Error: junk not used in the model block