Fix exception for connectable not found in Network Modification connection and disconnection #3069
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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?
If you use for example a ConnectableConnection on a non-existing connectable or on a TieLine (which is not a Connectable), the application of the NetworkModification will crash due to a null pointer exception
What is the new behavior (if this is a feature change)?
You will now get a PowsyblException if you apply with
throwException==true
or the Network Modification will not be applied and the error will be loggedDoes this PR introduce a breaking change or deprecate an API?