constraint: fix mask attribute

PyPSA / linopy

Linear optimization with N-D labeled arrays in Python

https://linopy.readthedocs.io

MIT License

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Closed FabianHofmann closed 7 months ago

FabianHofmann commented 7 months ago

closes #237

The .mask attribute of the Constraint class was fixed to return a proper boolean xarray.DataArray object.
The printout of masked constraints was fixed.