Fix crash inferring on NewType named with f-string

[jacobtylerwalls]

Steps

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Description

The f-string here:

new_type = NewType(f'IntRange_{t}', t)

was altered by astroid here to remove its final ':

typename = node.args[0].as_string().strip("'")

That caused a string parsing error, since there was an unterminated f-string.
Solution in this PR is to short circuit, rather than cope with a string formatted at runtime.

Type of Changes

	Type
✓	🐛 Bug fix

Related Issue

Refs PyCQA/pylint/#5770

[Pierre-Sassoulas]

Thank you for finding this crash and fixing it !

Did you check that pylint's tests are still passing with this change ?

[jacobtylerwalls]

Did you check that pylint's tests are still passing with this change ?

They are!

---

Will a regression test also be needed in Pylint or is this test sufficient?

[Pierre-Sassoulas]

Will a regression test also be needed in Pylint or is this test sufficient?

We generally close the pylint issue when the regression test is merged.