[Network modifications] Fix: no exception should be thrown if boolean throwException is false

[colinepiloquet]

Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines
• [x] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

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?

The boolean raise_exception is ignored when using network modifications.

What is the new behavior (if this is a feature change)? When creating a feeder bay, if the boolean is true, an exception will be thrown, same for the creation of a line or a two windings transformer.

Does this PR introduce a breaking change or deprecate an API?

• [ ] Yes
• [x] No

[colinepiloquet]

To be tested on creation of elements without bay