Fix SA Exception not same number of equations and variables #1321
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Please check if the PR fulfills these requirements
Does this PR already have an issue describing the problem?
No
What kind of change does this PR introduce?
Bug fix
What is the current behavior?
For a contingency isolating a bus with:
we get a PowsyblException: Expected to have same number of equations and variables
This didn't occur before #1275, so this looks like a regression.
It seems the BUS_V variable remains active for the isolated bus.
What is the new behavior (if this is a feature change)?
No more exception
Does this PR introduce a breaking change or deprecate an API?
Other information: