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Please check if the PR fulfills these requirements
Does this PR already have an issue describing the problem?
powsybl/pypowsybl#919
What kind of change does this PR introduce?
Bug fix
What is the current behavior?
In some Matpower cases like the 'case9241pegase', we have a phase shift != 0 and a ratio == 0. We end up in that case with a 0 ratedU1 in IIDM.
What is the new behavior (if this is a feature change)?
We consider now in that case that the 0 in the ratio means no change and so on 1 and create a phase shifter with the given phase shift and a 1 voltage ratio.
Does this PR introduce a breaking change or deprecate an API?
If yes, please check if the following requirements are fulfilled
What changes might users need to make in their application due to this PR? (migration steps)
Other information: