Add fix to Matpower importer to import some pglib files #3256
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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?
Feature
What is the current behavior?
Some matpower files like pglib_opf_case1354_pegase.m from https://github.com/power-grid-lib/pglib-opf cannot be imported because the generator column count correspond to v1 format and not v2.
What is the new behavior (if this is a feature change)?
We accept to read the file anyway even with missing columns.
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: