remove debugging assert

Author: rschwarz

mip/highs.py

@@ -765,7 +765,6 @@ def constr_get_slack(self: "SolverHighs", constr: "mip.Constr") -> numbers.Real:
         activity = sum(coef * var.x for var, coef in expr.expr.items())
         rhs = -expr.const
         slack = rhs - activity
-        assert False
         if expr.sense == mip.LESS_OR_EQUAL:
             return slack
         elif expr.sense == mip.GREATER_OR_EQUAL: