Constant constraints

[termoshtt]

Constraint without any decision variable like following causes segmentation fault in CBC solver with Python-MIP 1.15. https://github.com/Jij-Inc/ommx/actions/runs/9698846012/job/26766373894

    x = DecisionVariable.continuous(0)
    instance = Instance.from_components(
        decision_variables=[x],
        objective=x,
        constraints=[
            # 1 >= 0 is always true
            Linear(terms={}, constant=1) >= 0,
            x <= 1,
        ],
        sense=Instance.MAXIMIZE,
    )

This has been reported in coin-or/python-mip#213, coin-or/python-mip#238 and some linked issues, and fixed in coin-or/python-mip#237.

We use latest commit of Python-MIP coin-or/python-mip@0ccb811 until the next version is released coin-or/python-mip#384